Game functioned properly for a period of time - now it's sits off for several months, then someone fires it up to play a game... Batteries are fresh. Upon startup, players 1 and 2 display 000000, and function properly during game play. Player 3 and 4 will start at 222222. Game play will change the numbers, but none of them are right.
Of note: First issue with display 3 and 4 was that they originally displayed 333333. I cleaned the door/diagnostics connector on the MPU board servicing another issue with the door - and displays 3 and 4 went from 333333 from 222222.
Any suggestion for where to start trouble shooting would be appreciated.