I ordered 2 door switches and 2 fuses. I replaced both upper switches. Upon completion there was a direct short when the door closed . I had photographed the 5 wires and was absolutely sure they were installed correctly . I assumed it was a short to ground on one of the wires . I removed each wire until the short went away . The wire was the wrinkled black wire that goes to the power supply . I removed the power supply to inspect it and found no problem. After spending hours exhausting every possibility I swapped the three wire switch and the microwave works. I am at a loss . The numbers on the switch were the same. I am an ASE Master Mechanic . No wires touched . They were tight . They were correct . The last step was to swap the switch . All is well .