Its probably a stuck broil relay.
Replace relay. Are you good at soldering? If you can buy a replacement relay you could solder it on.
Disconnect the broil wires and insulate them. Broil no longer works, but you can still bake.
Remove computer, send it off to be repaired. reinstall it when it comes back.
Buy new computer board. $ears says can get them and they are around $212.