Quoted from frunch:
NICE!!!! I really felt like that was a shot in the dark at the time, but it makes sense. I'm glad you had noted it's behavior was happening once you started the diagnostics--that's what led me down the path i followed in Clay's guide. I never would have known about the PIAs having the additional function for the special solenoids if it weren't for this thread. Interesting stuff!
It sounds like the game isn't keeping it's memory, going into 'audit mode'. (When you boot up the game, you have to do the quick on/off)...Usually means the batteries need to be replaced or there's a problem with the ram chip. Best solution is to eliminate the batteries altogether and install an NVRAM in place of the old ram chip. Also, you'll probably need to re-pin the connectors to the master display board and mpu to get more reliable displays. Note the master display board has special edge connectors, not sure what part # off-hand but you'll probably need to replace those too.
I'm really excited that you got to the bottom of this problem, it was an oddball! Congrats!
Wow this is something I will investigate, and check it out. Whats confusing is what the DIP switches should be set too. I've actually removed the chips and reseated them. Tomorrow I will fire it up thanks Frunch !