My system 80B (Rock Encore) melted down the outhole coil. Replaced the coil and swapped in another, known working driver board, and everything plays great. On the original board I can't located the U45 transistor that is responsible for the outhole coil. The Q64 (2N3055) was burt. I replace it and repaired any suspected trace damage but no avail. Can someone help me out on how to diagnose this problem. When I put this board back in the machine everything plays fine except the outhole coil. It's no longer stuck on but won't energize.

After sorting through the driver board solenoid 9 is the out hole coil and is driven by Q59. Replaced a bad transistor (2N6043) and it's up and playing again.