Electrical in the house is now resolved. I had: 1. a bad connection (clip or something) on one of the lines from the power company. 2. a bad breaker, and 3. a switch where the lows from two different circuits were wired together, and as it happens, they were on the A and B sides of the board.
Once all these were fixed, still no power to the dishwasher. Turns out the line to the dishwasher was capped off and abandoned. I have now reconnected it, and it shares a circuit with the dispose-all only.
Next project: There's a valve in the dishwasher that's probably 60 years old. When I opened up the dishwasher, I found the round valve handle laying on the floor, next to the valve. Considering the drip marks on the outside of the tub, I think I want to have the valve replaced before I do much else. One of the major charms of this place is the wood floors, and I don't think I want to flood them.