Okay so this game was brought to me to clean up and "just get it playing." When the guy dropped it off, he said it hadn't worked in 15 years. We pulled it out of his truck and sat it in my garage, and when I plugged it in, it kicked out a ball. He said "it hasn't done that in 15 years!"
So I cleaned up the playfield, and have a friend over to help me get it working. At the beginning of the day, the start button would cycle the machine, but never quit cycling. He adjusted the slam tilt switch to test if the switch was stuck on. It was not. He readjusted that back to how it was, but now the start button doesn't work, but now if you drop a dime, it REMOVES a credit from the backbox and starts a game automatically. If you drop a quarter, it DOES NOT add a credit, but immediately serves a ball into the lane and starts a game. The scoring seems to work correctly. The little rule card window DOES NOT show which ball is active via the light, but after 5 balls will read GAME OVER just fine. We have tested the bulbs and they work so something wrong there as well.
I'm so sorry to come at you with so many questions but honestly EM's are just beyond me. ANY advice at all I would appreciate, and if you have any questions fire away and I will do my best to answer them.