Quoted from Lermods:Is it possible the switch you unplugged wasn’t for the loop? Stern has been known to make connections incorrectly. I had ramp optos plugged in incorrectly on avengers. If you unplug it and go into switch test, does it still register?
I unplugged switch nr 58 (big loop enter), so that was correct. Kinda… because I followed your suggestion and smacked the playfield in switch test. Nothing registered, but when I pressed the left flipper button, it activate 3 switches: left, up left AND big loop exit. I don’t think that is supposed to happen. Big loop exit (nr 59) is an opto. When I roll a ball through it, nothing registers. But when I let it drop near the opto, I get a reaction in the swicht test. The vibration of the ball drop (or the vibration of the flippers? or smacking your fist (if there was enough space))) seem to activate the opto. Looks like it might be the same issue like you mentioned for you avengers.
So actually I disconnected a switch that didn’t gave an error. I have learned that the manual exists for a reason