Well, BLK-9. I happened to walk a unit and spotted the same yellow spots (not as bad). It was the first time I found a defect, I was happy about. It meant that it wasn't water damage.
What we think happened was a cleaning agent got on there and was not rinsed off. (its not until you read the bottle that it says it should be rinsed with water). Who knew. We ended up using a different cleaner to clean off the residue of the first cleaner.
Maybe try a spot and see if that yellow wipes off the surface.
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