Quoted from EvanDickson:
The one at the eject point works too. I don't think it could be a switch issue, since the kick out cool should fire every time in test regardless of switches. Hoping it's u2. Otherwise I guess I'm looking at a broken wire that doesn't look broken, somewhere between board and coil.
Don’t forget the driver board only controls the relay on the solenoid expander. The relay completes the circuit to fire the coil. It’s designed this way because the coil draws too much current and would overload the driver transistor. The relay can handle the extra current so it becomes the “driver”.
With the backbox open and the playfield up, ground the tab of every driver transistor until you find the one that controls the kicker (ignore this if you already know which one it is - sorry, I don’t have the means to look it up right now). Make sure the relay clicks every time you ground the tab. You may have to disconnect the coil to hear it. If that’s good, run the coil test and make sure the relay clicks in every cycle. If it does, then you know your problem is with the high current contacts in the relay, the board connector, or the wiring to the coil. If the relay clicks intermittently during the coil test, then it is driver related.