[copperx]

My serial number is affected, but they want to keep the test running 24h to make sure the GPU is faulty. Also, they refused to replace my 2012 LG screen with obvious ghosting.

The AppleCare for my 2012 rMBP has expired, but is it normal for an Apple store to be so stingy about repair extension programs?

[starquake]

The best way to show the problem for me was to set the wallpaper to some grey colour (try which shade works the best). Open a browser (or any other mainly white screen with some text) keep it there for like 3 minutes. Log off and the grey background will be showing the problem more clearly. Maybe that will help. Mine was out of warranty but they fixed mine!