It'll start a game even if it can't move the solenoid, so those two not working isn't your problem here. First thing to check is if the start button registers in the switch test.

As for the clone target switch, test continuity between the two wires going to it to make sure it's really not shorted.

That should have been handled when the boards were serviced, shouldn't it?

The test doesn't list problematic switches, just the lowest numbered closed switch.

There's only one diode on the switch, the other is a capacitor. Try clipping one leg of the green capacitor and see if the problem goes away. If there's continuity across the wires then it'll read as closed to the mpu, so there must be a problem somewhere