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this was exactly the issue I had with @lazerwalker.com's PVM8220 iirc. It was an issue with the analog board iirc, I did a board swap from a working one, but if you take a scope to the test points on the board, the service manual will show you what to look for and how to adjust trim to get there.

That's great advice, I'll check it out! My only other hunch is that it might be the trim caps mentioned at the end of this video but I feel like that would affect more than one color www.youtube.com/live/jOPq1NI...

I'll throw in another thing that has happened to me before the inductors around the neck board can get tired sometimes and that can cause weird problems like this if the above doesn't work, trace blue back starting at the electron you'll have 2 identical circuits to compare each component to

have you tweaked the bias and vdrive on the neck board yet? I'd start there

Not on the neck board, but on the side panel I have open in that pic! I think the problems might run a little deeper since red and green adjust pretty easily youtu.be/VYqlAYpscQA?...

Sounds stupid but have you tried a different source and video cables? I’ve had at least two instances of the problem being at the source of the image and not the CRT. (Dodgy analog IO board from eBay, and later an inherent issue with component encoding on MiSTer that only showed up on trinitrons.)