I have a nice HH that had crappy boards so I replaced them with a new PI-80 board. I repined all of the edge connectors, replaced almost all of the switch and coil diodes, and I have cleaned all of the switch contacts.
The up kicker to go to the 3rd floor, will just give me an error when the ball loads in there.
The lower drop target bank never resets and is giving me trouble.
I have other switch issues, but for the most part those are the big ones.