The motors themselves are as solid as rocks. But you may have broken a wire inside.
You can disassemble them and reassemble them. I did that once to install longer threaded rods in one of the ones that had the internal threaded rod. It worked fine for me, but I remember there being warnings. At $10 or so per motor, it probably isn’t worth fighting.
So I would first pull the motor out of the machine and plug it straight into the mini rambo. If that still doesn’t work, then look closely at the parts of the motor wire you can see. If nothing looks like it is broken, then replace the motor.
My money is on a wiring issue outside of the motor though. That is very common and easy to miss.