Putting the game back together and getting a few weird things solved slowly.
New problem -- Right flipper actuation blows Fuse 7. Every time. Fuse 7 "protects the input to the +50V DC rectifier" (page 40).
Yes its the correct fuse... 3 of them now.
I can't find a grounding problem, I've verified all connections at both right flippers.
I'm not great at chasing schematics to determine where to start looking.
Any help is greatly appreciated.