I traced out both the palette RAM chips and all connections look good, no shorts or breaks. So the chips themselves are suspect. I'll have to order some more. At least they are socketed now.
Edit: It looks like it is working!
It needs the composite fix thing to get rid of the checkerboard pattern. Graphics look fine, despite the palette RAM failure. Maybe it's some parts of the RAM that the game isn't using. I gave it a quick play, it seems okay, didn't check the sound yet.
It's weird that the diag ROM doesn't run, but maybe it's these used EPROMs I have. Waiting for a new bulb for the eraser.
I've been looking for an excuse to get a Retro Chip Tester Pro, but it doesn't support the CXK5864BSP anyway, or at least the website doesn't mention it.
I the mean time I need to tidy that inductor up. It needs fixing down somehow. Could use hot melt, or should I go the whole hog and use silastic?