I tried the Disk Utility First Aid. Got a green at the end. Here's the log file. No problems reported.
Verifying storage system
Performing fsck_cs -n -x --lv --uuid 0B192D47-2A8B-420A-A3E5-02BD1AB2D4FD
Checking volume
disk1s2: Scan for Volume Headers
disk0s2: Scan for Volume Headers
disk1s2: Scan for Disk Labels
disk0s2: Scan for Disk Labels
Logical Volume Group 0B192D47-2A8B-420A-A3E5-02BD1AB2D4FD spans 2 devices
disk0s2+disk1s2: Scan for Metadata Volume
Logical Volume Group has a 1609 MB Metadata Volume with double redundancy
Start scanning metadata for a valid checkpoint
Load and verify Segment Headers
Load and verify Checkpoint Payload
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Load and verify Transaction Segment
Incorporate 58 newer non-checkpoint transactions
Load and verify Virtual Address Table
Load and verify Segment Usage Table
Load and verify Metadata Superblock
Load and verify Logical Volumes B-Trees
Logical Volume Group contains 1 Logical Volume
Load and verify 3861CB70-F4F0-460A-8844-D91DF0B0877A
Load and verify 327419C5-77ED-4E1A-9519-8687314F6CEF
Load and verify Freespace Summary
Load and verify Block Accounting
Load and verify Live Virtual Addresses
Newest transaction commit checkpoint is valid
Load and verify Segment Cleaning
The volume 0B192D47-2A8B-420A-A3E5-02BD1AB2D4FD appears to be OK
Storage system check exit code is 0.
Verifying file system.
Volume could not be unmounted.
Using live mode.
Performing fsck_hfs -fn -l -x /dev/rdisk2
Performing live verification.
Checking Journaled HFS Plus volume.
Checking extents overflow file.
Checking catalog file.
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Checking volume bitmap.
Checking volume information.
The volume Macintosh HD appears to be OK.
File system check exit code is 0.
Restoring the original state found as mounted.
Operation successful.