Okay, so that's progress. Just a brief description of special solenoids. These are solenoids that are controlled by both the MPU (you can go into test mode and fire the coil) and directly by playfield switches. The switch signals come in on the 2J13 connector. Each switch on the playfield gets a black wire (logic ground) from connector 3J3-3, which then comes back through 8J3 and 2J13 according to the chart I've attached. You need to inspect those switches that have coils that lock on with 2J13 connected, but do not lock with 2J13 disconnected, because those wires are getting a signal from somewhere. Either something touching in the playfield, a closed switch, or a chafed wire.
Those switches also have a series RC circuit (Resistor and Capacitor) in parallel. That circuit holds the signal longer than the switch itself, to let the solenoid react. If that parallel circuit has shorted (bad capacitor), that will also cause this problem. To test, you can remove one leg of the capacitor to see if the problem goes away.
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