Do-It-Yourself Story

Found coupler completely loose, shaft attachment point disintegrated; melted? On motor, plastic-like material stuck on shaft. Easily found matching microwave model on AppliancePartsPros.com and matching parts. Oddly, like other appliance parts sellers, the motor was listed for about $60, but a second equivalent one for about $23. Photo matched original. Ordered the cheaper motor + coupler, perfect matches to original. Motor is easily accessible by easily removing the microwave bottom cover with about 5 Phillips screws. Bottom cover is held in place/hinged at back, no need to remove. Also no need to remove the lamp that is within the bottom cover. I unplugged the 2-pin motor connector and marked the top side, although it probably doesn't matter since it's an AC motor. Motor is held in place with 1 Phillips screw toward the back and slides into a slot at the front. Easily replaced motor + coupler, perfect fix. Coupler is keyed and just slides onto motor shaft. Had a little difficulty getting the motor mounting screw in since the microware is an under-cabinet model and did not need to remove it. Used cell phone camera and flashlight to help see the screw hole.