During self clean, the oven locks and begins the cycle. After about 20 minutes, I am getting an F9 error code, which seems to be related to the door sensor. The door is definitely closed and locked. Perhaps a bad sensor or something? Is this something I can troubleshoot and replace parts myself?

You might try someone else, think he's gone.

I’m no expert, but try this: turn the breaker off for 5 minutes. See if this might clear that silly electronic control.

Good luck to you.