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Might have been better to check the control signals looked right first, but maybe too late now.
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Did we not already do that, hundreds of posts back? I'm sure there was a point where we did spend time on those buffers but at the time we couldn't really pin anything on them.
The suspicion that reads from both the display RAM and the system RAM are bad has only really arisen since we had the Daver2 test code to try, and the UE9 and UE10 buffers are in the read path from both.
If you do want to re-check the pin 1 / pin 19 signals on UE9 / U10 Slothie's rev c test code will make that easier as it will spend a lot of time writing as well as reading.