Quoted from Coyote:It could, yes! I don't have a matrix chart for this game in front of me, so I can't check, but it's possible you have a bad diode, and it's causing switch matrix issues.
The first thing I would do is checking the trough - the easiest way to check for divots or stuck balls is to play a game with the door open - as soon as you see it happen, and before the ball in play drains, look at the underside of the trough - look at the balls in the trough, and make sure that they are all in line, all rolled down to the front.
You can then put an extra ball in the Lock area, and do more switch tests in the trough - see if anything changes.
You mentioned something about a bad opto, it wouldn't hurt cleaning the boards off when you remove them, too.
Forgive me for my ignorance herein - again, quite new to this. What's a diode? Apologies for not knowing.
Played the game a fair amount last night without issue, but did not have many locks. Then, tonight, got a bunch of locks, and game "ended the ball / advanced to the next ball/player" a bunch. The trough appears to be in good shape, with the balls rolling nicely, and all the switches appear to activate correctly during tests, so more and more I think it's somehow related to the lock...
Any additional help (you guys have already been great) would be much appreciated!