Clean the optos. Test the optos.
You'll have to remove the POA to do this.

Mechanical or electrical?

Check to see if the POA set screw is tight.
So if the motor spins, its output is transferred through the gear box and the output shaft turns.

Does motor spin? No? Then make sure the connectors are plugged into boards. Under pf motor board and power driver board.

Is the POA leaning left or right, blocking an opto?
The POA should be centered before connecting the motor.
After that, go into Tests menu, a find the mini pf test, it will self calibrate. Then you can adjust the tilt with the coin door switches.
See where that gets u.

Here's the diagram.
So, you've confirmed that the mini playfield, when the set screw is loosened will pivot freely left to right on its own...eliminating mechanical issues with that. You've confirmed that the gear box also turns freely with the motor and mini pf disconnected. You've tested the optos in the switch test? The optos are clean and functioning properly. The connectors at J118 and J126 have been reseated. The connectors on the bridge driver pcb have been reseated? The leds are lit on the bridge driver pcb? Checked all fuses on the power driver board?
You've removed the mini pf and conducted a mini pf test from the test menu AFTER doing a factory reset?

If things still don't work, you will now be able to probe for 12V.

But essentially, work your way backwards from the mini pf to discover the problem.

If you disconnect the motor from the gearbox, you could unplug it from its associated EMI board and might be able to plug it into the EMI board of the idol rotor. Just to see if it works.

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Check for 12 volts at j118. Pins 2 and 3.
Are connectors j118 and j126 keyed and plugged in properly to their corresponding male header pins?
If u have 12volts at j118 then u have a bridge driver board pcb problem or there's a problem with the idc connectors or wire. Test the voltage on the j1 on the bridge driver board or check for continuity from the connector at j118 and j1.
Hate to see u flush away cash buying or replacing components that are fine. But use logic and figure out what and where the problem lies. Try to narrow it to either the pf or the power driver board.

verify voltage across pins 4 & 5 at j1 of the bridge driver pcb.
Now it's time to look at j126.
Can you take a photo of this connector on the power driver board?
I assume this connection tells the motor to turn on and switches direction.
If the wiring and connector are correct it's time to look upstream from j126.

Also. While u got the camera out, take a photo of the poa optos with the interrupter installed.

Did you test the POA optos in switch test? If they are not functioning, the motor will not work.
You said you replaced the opto board. But never confirmed if they work.