The 2 'taped' wires are the 'knocker' wires that go to the knocker solenoid in the headbox (which is removed, hence why the wires were cut and left hanging).

I'm VERY surprised you're having cpu issues, as i played that machine a LOT and it worked everyday without hassle, obviously the lack of score-display didn't help things).

Anyway, it's in good hands with beaky's touch ;-)