I have a strange issue thats puzzling me. Every switch registers. But if there is a ball loaded in switch 41 (Under lock sw 1) and you test switch 51(l.bank top) it will read 2 switches number 51 and now 47 (under Borg hole). When you play the game if there is a ball loaded in under lock 1 and you hit the l.bank top switch the game starts a mode like you have hit the start mission hole. I understand why the game starts the mode because it thinks its getting that switch reading I just have hit a point where I am asking for any possible help??

I changed the diode on switch 41, I swapped a known good 16 opto board and even replaced the optos. And the game will start a mission when you hit the 41 switch. If theres no ball under lock1 game plays fine and will not start a mission like it suppose to.

HELP!

Fixed. I checked all diodes as suggested. One had cracked solder joint to switch on diode. Replaced with new diode on that switch and game is fixed no more double reads on switches. Thank you for advice.