#1 - the game isn't sensing the targets are down. I would guess the +12 that the opto board needs isn't making it there. Check the power connector at the opto board to make sure it's plugged in. If it is, go into the backbox and on the left side of the interconnect board, there are 2 connectors that are 3 pins - 1 brings the +12 to the interconnect board, the 2nd one takes it from the interconnect board to the playfield - perhaps one of those is unplugged.

Regarding the motor, check the voltage at the motor, perhaps it's not getting the correct voltage to run.

Also regarding the motor. check the circuitry on its driver board, I had lots of issues, a few problem components just pulled off board but the main culprit turned out to be a bad lm339.

Pull the connectors off the interconnect board and look for any burnt pins.
I had burnt pins on mine that kept my seafood wheel from turning. Wish I recall which connector that it most likely would be.

What John says. Both the drop target optos and the stepper motors use 12V, so most likely it's either disconnected either at the input or output of the interconnect board or where it leaves the power supply (but the power supply itself should be fine as the CPU wouldn't boot without 12V.)

because of these 2 observations, I would say 12 volt and Gnd is present on the stepper-motor-driver-pcb.
I would first check data A and B input on this board and follow these wires to other board.

P1-stepper.JPG