LDE9304ACE electric dryer, all lights on, continuity checked?

I have read the extensive procedures on this site on how to find out which part is bad on my old Maytag. It's about 25 years old. Two years ago, the motor was replaced after a flood. I did this myself and got a good look at everything in the process.

The red lights come on (including the humidity detector, when set to a program that requires it), when the start switch is depressed.

When I unplug a door latch wire, the lights don't come on.

I have checked continuity in the two thermal fuses I located, and the two other knobby looking things next to them, down under the drum. All have continuity.

I have swapped out the timer and the start switch. Neither helped. (I realized too late that if you don't press the button on the start switch while checking continuity, you might actually have a good switch and not know it. You have to close the circuit by pressing the button. A tip for the DIYers.)

What preceded this situation: One day, the dryer would not turn off when it reached the end of cycle. It would buzz continuously, while still running. I would go to the basement and simply shut it off manually. This went on for a few days. The final blow happened when my son was drying multiple loads of clothes, and finally it wouldn't turn on again. This is why I thought it was the timer, because it wasn't shutting down properly.

It's been a while since I had the top face open, but I remember looking for burned areas and found none.

Loose wire on the motor? What could have caused this to happen?