Model 3 Step 2.0 video board textures problem

[Tailsnic Retroworks]

Hi everyone. I have come here to ask you about a not documented error of Model 3 Step 2.0. I have this error in screen:



And this random access errors in boundary scan:



And this error in video test:



It says texture memory 10 error, but I suppose this "10" is a byte value seeing many pictures have been posted in this forum.

The thing is, how can I know which of the 8 rams is the culprit of the failure. I have broken donor boards for extracting them. Many thanks for the help.