I have a Bally lamp driver board that will not light four different lamps even though their transistors (2N5060) test good out of the game. Upstream, they go to three different IC's. Is it possible that they will fail in test mode and/or gameplay but pass an out of game diode test? If I put a separate ground jumper on the ground tab, they will light.

Thanks guys, I replaced a couple of 5060's that had tested good with new 5064's and now the feature lamps work fine.

Now, what can I do to fix a sticking star rollover button? It goes down when rolled over but the blade of the leaf switch doesn't push it back up. I don't know if it is a weak leaf or dirt in the rollover. I tried cleaning it with 91% alcohol, didn't do any good. Suggestions?