I had a problem (problems minor starting issues but mostly GI) with my (CFTBL) and it was a short from a coil but believed to be a bridge rectifier - strange one that had me stumped for a while but worth mentioning to at least aid at reducing where it could be. With mine when you pulled the playfield out of the cabinet - the right hand side coil ball eject from the tunnel ramp up onto the playfield was so close but depended on the angle you pulled it out to the ball shooter rod. At some stage it the coils wires must have snagged on to the shooter rod a few times dislodging a wire (still connected but stretched out) from the coil which then created a short but not obvious.
A hard one to identify and for some reason caused various issues.
Could be a long shot but worth a look..., if anything one to store in the memory banks for the future.
