I picked up a batman forever last week, and am gradually going through it. Everything is playing well, the occasional bat cave return ramp lip out (probably levelling issue). Tonight I noticed that I've never seen any of the back wall flash lamps go off, or the blue flash lamp behind the ramp. The under play field flashers work fine. Could this be something as simple as a disconnected cable? I did have to remove the head to move the machine, but can't find any spare cables to go to the boards.