Any oven/stove (repair) experts here?

[handyj]

I've dealt with Whirlpool ovens having strange circuit board problems with electrochemical dendrites that cause shutdown and PF errors as you describe. Google consumeraffairs for "whirlpool oven dendrites" and welcome to the weird world of electronic circuitry. If you dig further you can find DIY repairs ranging from chemicals to pencil erasers (this worked for me but no guarantees). Good luck