Fixing My Affinity Washer: Stopped Suddenly; Won't Start; E41 Error

My Frigidaire Affinity washer stopped mid-cycle and wouldn't start again. It showed the time remaining and then would show "Pause." After some research, I found I could extract an error code: E41 - a problem with the door latch/lock. A quick google showed this was a common failure but the wisdom of the internet pointed to either the door lock or the control board. I thought I'd dig in to see what I could find.
A great help to my investigation was this video by Bill Newberry:
• Frigidaire / Electrolu...