I tracked down the problem with the Yagov kicker and upper targets not working on my F14. Transistor Q42 was indeed broken, so I replaced it, which fixed the problem.
Unfortunately, this spawned some solenoid problems. The diverters no longer work, and neither do the slingshots or pop bumper. I figured this could be related to the first problem, so I disconnected 1J8 and 1J10 and ran the solenoid test again. Problem was still there.
Did I break my CPU board?