Symptoms pointed to the door switch. I got out the multimeter and tested it. It was broken! It is fortunately a $20 part. Not very much. I got the new part on Wednesday. And it felt so good to have my washing machine back. Three days without doing laundry is a lot when you have six people in your family. Four of us have pretty small clothes for small bodies, and that helps. Here is a picture of my project. Not much disassembly involved. And I have a helper. Actually he wants to take that screwdriver and poke a hole in the wall. I didn't let him.
I will add that after I put in the part, the wash cycle wouldn't fill. So we went a day filling on rinse, then switching to wash. When I went to figure out why, I discovered a plug I had forgotten to reattach after the repair. I think I would be a disappointment if I tried to fix somebody else's machine. For our family, my husband is a satisfied customer. But he doesn't do the laundry.