AHT error 4mem/9/400000000: 0x84e09d18

Having issues with frozen screen and boot loops with my MacBook Pro.

High Sierra (10.13.6), 15-inch, Early 2011, 2.2GHz

Ran hardware test and received error 4mem/9/400000000: 0x84e09d18

Panic report:

Mon Nov 12 20:17:50 2018

*** Panic Report ***

panic(cpu 7 caller 0xffffff800036ac8a): "Possible memory corruption: pmap_pv_remove(0xffffff8012c3eda0, 0x7fff94be3000, 0x2232b8, 0x80000002232b8024, 0xffffff910e2abc54, 0xfffffe93398e3f18): pv not on hash, head: 0xffffff8017175250, 0x7fff94be3000, priors: 2"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/xnu/xnu-4570.71.13/osfmk/i38 6/pmap_internal.h:861

Backtrace (CPU 7), Frame : Return Address

0xffffff910e2ab8d0 : 0xffffff800026b1c6

0xffffff910e2ab920 : 0xffffff8000393a74

0xffffff910e2ab960 : 0xffffff8000385d44

0xffffff910e2ab9d0 : 0xffffff800021d1e0

0xffffff910e2ab9f0 : 0xffffff800026ac3c

0xffffff910e2abb20 : 0xffffff800026a9fc

0xffffff910e2abb80 : 0xffffff800036ac8a

0xffffff910e2abc80 : 0xffffff800036b544

0xffffff910e2abce0 : 0xffffff80002f5bef

0xffffff910e2abe20 : 0xffffff80002f53d2

0xffffff910e2abe60 : 0xffffff8000294d73

0xffffff910e2abea0 : 0xffffff8000713c40

0xffffff910e2abf10 : 0xffffff80007139e3

0xffffff910e2abf30 : 0xffffff80007139b9

0xffffff910e2abf40 : 0xffffff8000803008

0xffffff910e2abfa0 : 0xffffff800021d9c6

BSD process name corresponding to current thread: Finder

Boot args: -x

Mac OS version:

17G3025

Kernel version:

Darwin Kernel Version 17.7.0: Wed Oct 10 23:06:14 PDT 2018; root:xnu-4570.71.13~1/RELEASE_X86_64

Kernel UUID: 4C560F2C-3F3C-3423-B806-2C4D39D570A0

__HIB text base: 0xffffff8000100000

System model name: MacBookPro8,2 (Mac-94245A3940C91C80)

System uptime in nanoseconds: 229739881710

last loaded kext at 131212281322: com.apple.driver.AppleHWSensor 1.9.5d0 (addr 0xffffff7f845b8000, size 28672)

last unloaded kext at 61143612867: com.apple.driver.usb.AppleUSBUHCI 1.2 (addr 0xffffff7f81500000, size 147456)

loaded kexts:

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.driver.AppleGraphicsDevicePolicy 3.20.14

com.apple.kext.AMDLegacyFramebuffer 1.6.8

com.apple.driver.ApplePolicyControl 3.20.14

com.apple.driver.AGPM 110.23.37

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AGDCBacklightControl 3.20.0

com.apple.kext.AMD6000Controller 1.6.8

com.apple.driver.AppleBacklight 170.12.6

com.apple.driver.AppleMuxControl 3.20.14

com.apple.driver.AppleLPC 3.1

com.apple.driver.ACPI_SMC_PlatformPlugin 1.0.0

com.apple.driver.AppleMCCSControl 1.5.5

com.apple.driver.AppleIntelSNBGraphicsFB 10.0.4

com.apple.filesystems.autofs 3.0

com.apple.driver.AppleUSBTCButtons 254

com.apple.driver.AppleUSBTCKeyboard 254

com.apple.driver.AppleIRController 353

com.apple.filesystems.hfs.kext 407.50.6

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.BootCache 40

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0

com.apple.AppleSystemPolicy 1.0

com.apple.iokit.SCSITaskUserClient 404.30.2

com.apple.filesystems.apfs 748.51.0

com.apple.driver.AirPort.Brcm4331 800.21.30

com.apple.driver.AppleSDXC 1.7.6

com.apple.iokit.AppleBCM5701Ethernet 10.3.1

com.apple.driver.AppleFWOHCI 5.5.9

com.apple.driver.AppleAHCIPort 329.50.2

com.apple.driver.AppleSmartBatteryManager 161.0.0

com.apple.driver.AppleACPIButtons 6.1

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.1

com.apple.driver.AppleACPIEC 6.1

com.apple.driver.AppleAPIC 1.7

com.apple.driver.AppleIntelCPUPowerManagementClient 220.50.1

com.apple.nke.applicationfirewall 183

com.apple.security.TMSafetyNet 8

com.apple.security.quarantine 3

com.apple.driver.AppleIntelCPUPowerManagement 220.50.1

com.apple.iokit.IOSurface 211.15

com.apple.kext.AMDSupport 1.6.8

com.apple.AppleGPUWrangler 3.20.0

com.apple.driver.AppleBacklightExpert 1.1.0

com.apple.iokit.IONDRVSupport 519.21

com.apple.AppleGraphicsDeviceControl 3.20.14

com.apple.driver.AppleGraphicsControl 3.20.14

com.apple.driver.AppleSMBusPCI 1.0.14d1

com.apple.kext.AMDLegacySupport 1.6.8

com.apple.driver.IOPlatformPluginLegacy 1.0.0

com.apple.driver.IOPlatformPluginFamily 6.0.0d8

com.apple.driver.AppleSMBusController 1.0.18d1

com.apple.iokit.IOGraphicsFamily 519.21

com.apple.kext.triggers 1.0

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 6.0.7f11

com.apple.iokit.IOBluetoothHostControllerUSBTransport 6.0.7f11

com.apple.iokit.IOBluetoothHostControllerTransport 6.0.7f11

com.apple.iokit.IOBluetoothFamily 6.0.7f11

com.apple.driver.AppleUSBMultitouch 262

com.apple.driver.usb.IOUSBHostHIDDevice 1.2

com.apple.driver.usb.networking 5.0.0

com.apple.driver.usb.AppleUSBHostCompositeDevice 1.2

com.apple.driver.usb.AppleUSBHub 1.2

com.apple.filesystems.hfs.encodings.kext 1

com.apple.iokit.IOSCSIMultimediaCommandsDevice 404.30.2

com.apple.iokit.IOBDStorageFamily 1.8

com.apple.iokit.IODVDStorageFamily 1.8

com.apple.iokit.IOCDStorageFamily 1.8

com.apple.driver.AppleThunderboltDPInAdapter 5.5.5

com.apple.driver.AppleThunderboltDPAdapterFamily 5.5.5

com.apple.driver.AppleThunderboltPCIDownAdapter 2.1.3

com.apple.driver.AppleThunderboltNHI 4.7.3

com.apple.iokit.IOThunderboltFamily 6.7.9

com.apple.iokit.IOAHCISerialATAPI 267.50.1

com.apple.iokit.IOAHCIBlockStorage 301.40.2

com.apple.iokit.IO80211Family 1200.12.2

com.apple.driver.corecapture 1.0.4

com.apple.iokit.IOEthernetAVBController 1.1.0

com.apple.driver.mDNSOffloadUserClient 1.0.1b8

com.apple.iokit.IOFireWireFamily 4.7.2

com.apple.iokit.IOAHCIFamily 288

com.apple.driver.usb.AppleUSBEHCIPCI 1.2

com.apple.driver.usb.AppleUSBEHCI 1.2

com.apple.driver.usb.AppleUSBHostPacketFilter 1.0

com.apple.iokit.IOUSBFamily 900.4.1

com.apple.driver.AppleUSBHostMergeProperties 1.2

com.apple.driver.AppleEFINVRAM 2.1

com.apple.driver.AppleEFIRuntime 2.1

com.apple.iokit.IOSMBusFamily 1.1

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.security.sandbox 300.0

com.apple.kext.AppleMatch 1.0.0d1

com.apple.driver.DiskImages 480.60.1

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleEffaceableStorage 1.0

com.apple.driver.AppleKeyStore 2

com.apple.driver.AppleUSBTDM 439.70.3

com.apple.driver.AppleMobileFileIntegrity 1.0.5

com.apple.iokit.IOUSBMassStorageDriver 140.70.2

com.apple.iokit.IOSCSIBlockCommandsDevice 404.30.2

com.apple.iokit.IOSCSIArchitectureModelFamily 404.30.2

com.apple.iokit.IOStorageFamily 2.1

com.apple.driver.AppleCredentialManager 1.0

com.apple.driver.KernelRelayHost 1

com.apple.iokit.IOUSBHostFamily 1.2

com.apple.driver.usb.AppleUSBCommon 1.0

com.apple.driver.AppleBusPowerController 1.0

com.apple.driver.AppleSEPManager 1.0.1

com.apple.driver.IOSlaveProcessor 1

com.apple.iokit.IOReportFamily 31

com.apple.iokit.IOTimeSyncFamily 680.15

com.apple.iokit.IONetworkingFamily 3.4

com.apple.driver.AppleACPIPlatform 6.1

com.apple.driver.AppleSMC 3.1.9

com.apple.iokit.IOPCIFamily 2.9

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.pthread 1

com.apple.kec.corecrypto 1.0

EOF

Model: MacBookPro8,2, BootROM 82.0.0.0.0, 4 processors, Intel Core i7, 2.2 GHz, 8 GB, SMC 1.69f4

Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In

Graphics: AMD Radeon HD 6750M, AMD Radeon HD 6750M, PCIe

Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3034332E413031472020

Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0198, 0x393930353432382D3034332E413031472020

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.102.30)

Bluetooth: Version 6.0.7f11, 3 services, 27 devices, 1 incoming serial ports

Network Service: Wi-Fi, AirPort, en1

Serial ATA Device: WDC WDS100T2B0A-00SM50, 1 TB

Serial ATA Device: MATSHITADVD-R UJ-898

USB Device: USB 2.0 Bus

USB Device: FaceTime HD Camera (Built-in)

USB Device: Hub

USB Device: Apple Internal Keyboard / Trackpad

USB Device: BRCM2070 Hub

USB Device: Bluetooth USB Host Controller

USB Device: USB 2.0 Bus

USB Device: Hub

USB Device: IR Receiver

Thunderbolt Bus: MacBook Pro, Apple Inc., 22.1

The RAM (Kingston I think) was replaced when I bought the machine.

Should I just replace the RAM?

Any suggestions would be appreciated.