Does the game play? I had an issue a couple of months ago when I added a remote battery where when the batteries in, the AB solenoid would activate so only the B coils worked and the flippers didn't work. When I took a battery out I could hear the solenoid relax and all was normally. As I touched the battery to the contact I would hear the AB activate. Turned out to be the transistor in that circuit. The adjustment failure message occurred during this process until I replaced that transistor.