Speaking of switch tests. This was a fun few hours. After hitting any shot up the middle, it drops down into the green trough, then eventually the ball kicks back up onto the playfield. Mine was registering about 60% of the time all of the sudden. 40% it went into ball search.

1st try, take off opto's and clean them with q tip - Nope
2nd try - reseat connector, followed wires to a board and took off and reseated - Nope
3rd try - completely take off optos as it looked like the little white pegs behind the opto were not seated into the little hole behind them in the small green board to stay properly aligned. Just by looking at the optos they don't look they are pointing directly towards each other because of this. Misaligned opto, Has to be the issue, seems logical - Nope
4th try - push up the plunger to see if the opto reads it. The opto does read it but the plunger has to go up pretty high to register. Put a ball in to see where it sits and the bottom of the ball goes lower then the spot where the plunger registers on switch test. So it should register a ball as is... I'm Confused?
5th try - try to pull the opto back, when I pull the top of the opto back on either side, it registers the ball. I'm thinking I need to take off the entire trough and bend the ledge with the 2 screws that the opto sits on to realign it. This doesn't look like much fun. Before I did this I tried one more thing.
6th try - Bent down the saucer/circle shape spot that the ball sits in when its a rest about 1/8 inch. Seems to have been the fix although as it lines up when it registers it doesn't seem like it should have been the issue!!! But, I'll take it at this point. Just worked 10 times in a row. Now off to try a few more games.