Sorry for bringing up the old topic, but it's a problem that will never get old
I also have a similar issue with continuous power on one solenoid (center pop bumber) which basically started frying before any of the fuses went out. It's actually linked with Low power solenoid circuil, F104 with +60V on one coil side.
I unsoldered the GND wire from the solenoid, powered up the machine and the power on the coil is constant +60V + GND. Even if I unplug the cpu board from the power board, still the same.
Q46 and the diode are good - measured with multimeter.
The cpu board had some corrosion and the Escape button appears to be pressed by U16 even if the switches connector J205 is unplugged. Could it be that the corrosion caused the solenoid to fire up constantly? But why would it be locked even when the cpu is unplugged.
Any clues?