Gene, I checked to see if food became hot when the door is open and the fan and turntable are working. In fact, the food did not heat up, so I think you are right, and I'm now hopeful there is an easy solution here.
The microwave works properly on the timed cooking when the door is closed.
When the door is opened, the fan continues to run, and the turntable continues to turn. Interestingly, when you open the door repeatedly, the turntable changes directions almost every time. One time, however, the turntable did not move, and the fan did not turn on. So, now I wonder if there is something stuck in there that a bit of WD-40 might cure. In particular, I wonder about the lower door latch, which seems to have something to do with this problem. I don't have a diagram, and the manual is no help.
I'm very interested to read your suggestions before I take this thing apart and start spraying WD-40.
Tom
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