I looked at youtube to troubleshoot. I ordered two switches (#604) and attempted to replace them myself. The available youtube videos didn't address my specific model and I could not get the latch assembly (#605) behind the control panel that held the switches out without further disassembly. I was concerned about getting shocked by the capacitor (instructions to discharge were on youtube) so I contacted a local repairman and dropped the unit off. The repairman fixed it for $35 and knew a trick to replace the switches without taking out the assembly. He said and alignment for the door switches could be tricky if the latch assembly was removed so removing/replacing the switches in place was the best option. That made sense to me.
One of the two switches that were replaced was definitely bad. It had a dark spot when viewed from the side. It was not visible when installed in I also ordered a magnetron. There was no indication the unit was bad but the microwave is six years old and I've had one go bad before. It was another problem source in one of the youtube videos. I had the technician replace it.
The unit is installed in a cabinet above the oven. It took me about an hour to remove the unit, an hour to attempt to replace the switches, and an hour to reinstall it.