I had my screen replaced in November (purchased in October, listed as a due-bill item).
..This past weekend, I've just noticed that a very faint yellow border is present, and I notice it's more pronounced after sitting at my office's parking lot during the work day (uncovered parking for 8-9 hours; southern VA is starting to heat up with 90F/32C temps).
Hopefully Tesla figures out a final fix. Maybe the big surprise will be a complete replacement/upgrade path to MCUx where "x"=plug-and-play upgrade replacement... maybe not necessarily MCU2 but something that is designed to marry up with existing connectors for an easy swap and provide enhanced CPU capabilities (i.e. Beach Buggy, Dashcam, etc..).
Who knows... hoping the yellowing won't intensify.