Jeff - Try swapping to flipper opto boards on the cabinet.

OOps sorry Nino but I've done that about (3) so I'll edit thanks any way. I'll just add some other wierd symptoms that maybe unrelated but still flippers.(1) Fuse F904 lower left flipper was blown but LLF was working(2) EOS switch on LRF doesn't register in test even though with a DMM on it works ok(3) LLF coil was mounted ass about on flipper assly and had NO DIODES on it. as said when board swapped from corvette everythings all ok.