Another self clean blowout - Replaced fuse, top oven won't heat

Hi all

I have been able to figure out (with the help of this forum) how to unlock and replace the fuse in my Kitchen Aid kebk206bss double wall oven. So far, so good.

However, now only the bottom oven will heat. The top oven appears to start but doesn’t heat up.

Sounds like a thermometer issue…I’m hoping someone can tell me what part I need, and see if this is on the top of the oven near the fuse. If it’s in the back of the unit, does anybody know where, and have any pointers as to how I can get at it without damaging myself and my kitchen?

Thank you