I have two 128k boards with other problems than ram issues. And as you, I couldn'd find an answer on the internet. http://68kmla.org/forums/viewtopic.php?f=7&t=16269

You can try the caps (but there is just two or three electrolytics).

I have a book about repairing these boards and it talks about replacing the 6522...

The problem is the components on these boards are so difficult to unsold (without ruining the board...) . I didn't manage to do it.

I think you're analog board is OK.