Yesterday a screw fell into one of the pop bumpers areas and I didn't know it until I turned the game on. A pop bumper keep firing and then I discover the screw and got it out of the machine. Since then the winged monkey won't move especially to go back up to the castle. I assumed something shorted maybe a transistor. Any ideas where to start looking?

Just tried again today and after about 5-10 minutes it started working. Best I can tell the wiring harness much have got jammed just barely enough to foul things up. So thank you so much Steve_in_Escalon for the suggestion and nice it was a relatively easy fix!

Wish I just had walked away last night before I got so frustrated! I should know not ever work on my pins late at night and when tired. Just glad I didn't mess things up as I've so often done taking one minor problem and really screwing things up a ton!