MBP was repaired, but Ap crashes anyway

I had lots of crashes with stack pointing at com.apple.GeForce8xxxGLDriver gldGetTextureLevel. Because seems only me having this problem, I assumed that this is hardware problem. After MLB replacement I have similar crash. What are chances that this hardware issue with new MLB?
hread 0 Crashed:
0 com.apple.GeForce8xxxGLDriver 0x014bbfc6 gldGetTextureLevel + 958807
1 com.apple.GeForce8xxxGLDriver 0x01424f92 gldGetTextureLevel + 340259
2 com.apple.GeForce8xxxGLDriver 0x014405ca gldGetTextureLevel + 452443
3 com.apple.GeForce8xxxGLDriver 0x013cf58d gldAllocVertexBuffer + 13323
4 com.apple.GeForce8xxxGLDriver 0x013af97d gldDestroyContext + 40
5 GLEngine 0x01232c41 gliDestroyContext + 213
6 com.apple.opengl 0x931f1c17 cglDestroyContext + 432
7 com.apple.opengl 0x931f1cb3 CGLReleaseContext + 60
8 com.apple.opengl 0x931ee726 CGLDestroyContext + 29
9 com.apple.QuartzCore 0x93ebb535 fe cgl_destroycontext + 30
10 com.apple.QuartzCore 0x93edf4b7 fe_release + 414
11 com.apple.QuartzCore 0x93efdcd0 fe accelpurge + 149
12 com.apple.QuartzCore 0x93efda67 fe contextpurge + 85
13 com.apple.QuartzCore 0x93efd9ef fe glfinalize + 18
14 com.apple.QuartzCore 0x93edf4b7 fe_release + 414
15 com.apple.QuartzCore 0x93efd9a5 -[CIOpenGLContextImpl invalidate] + 27
16 com.apple.QuartzCore 0x93eea15e -[CIOpenGLContextImpl setOwner:] + 42
17 com.apple.QuartzCore 0x93efd953 -[CIContext invalidate] + 45
18 com.apple.QuartzCore 0x93efd8fe -[CIContext dealloc] + 34
19 com.apple.Aperture 0x00043251 0x1000 + 270929
20 com.apple.Aperture 0x000ac783 0x1000 + 702339
21 com.apple.Aperture 0x000c6bbf 0x1000 + 809919
22 com.apple.Aperture 0x0032fd60 0x1000 + 3337568
23 com.apple.Aperture 0x000ef282 0x1000 + 975490
24 com.apple.Foundation 0x9283f2be __NSFireTimer + 199
25 com.apple.CoreFoundation 0x9082d76a CFRunLoopRunSpecific + 3341
26 com.apple.CoreFoundation 0x9082ca56 CFRunLoopRunInMode + 61
27 com.apple.HIToolbox 0x92df5878 RunCurrentEventLoopInMode + 285
28 com.apple.HIToolbox 0x92df4f82 ReceiveNextEventCommon + 385
29 com.apple.HIToolbox 0x92df4dd9 BlockUntilNextEventMatchingListInMode + 81
30 com.apple.AppKit 0x9329c485 _DPSNextEvent + 572
31 com.apple.AppKit 0x9329c076 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 137
32 com.apple.AppKit 0x93295dfb -[NSApplication run] + 512
33 com.apple.prokit 0x96795958 NSProApplicationMain + 324
34 com.apple.Aperture 0x00003106 0x1000 + 8454
35 com.apple.Aperture 0x0000302d 0x1000 + 8237