The lower right pop bumper is locking on. I tested the TIP122 transistor (Q14) and associated 2n4401 (Q10): they're within spec. The switch is gapped properly as well. What next? Could it be a TIP36c transistor? If so, how do I know which one (can't find that they're connected)? I'm so close to having this game fully working back from the dead. DumbAss ChrisHibler