OK, here's one. Yesterday, I had swapped out the entire motor assembly with a known working one from another apartment, then the limit switches, then the eyes. Same problem, the motor (even not attached to the door) runs a second and stops. It was working intermittently but has gotten worse to the point it stops every time now. I don't know what's left but the wiring to the eyes or is there a transformer or something? Wires are run up into the ceiling.