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I looked for bad/cracked solder joints and saw none (though I did re-solder a couple just in case) and unplugged/plugged each connector a few times to clean. Still has the issue.
Looking at the schematic, I see no pincushion adjustment. Under "characteristics" for this board (9-754, one of a few covered by the schematic) it mentions "HORIZ. PIN/WIDTH ADJ - DIODE MOD."
Thinking that a transistor (or diode?) may be the problem. But I never actually learned circuit theory or how to really read a schematic so I'm kind of in the dark. I don't suppose anyone wants to take a look at the schematic, do you?
I'll probably not do too much else but it's an interesting challenge.
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