The extreme heat has opened up one of the thermostats / thermal cutouts (TCOs) in the oven.
If it was the bottom TCO or magnetron TCO, you should be able to access them by just removing the control panel.
But if it's the one on top of the cavity, the oven will have to come out of the wall, then you need to pull of the outer cover..If
so, the installation instructions are very handy, and it's best to have
two people since the microwave can be heavy and awkward.
You can download GE
owner's manuals and installation instructions here.There
should be a "mini-manual" (tech sheet) hidden inside the unit
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating components.
You should locate and look this over first.At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.
You can usually find
helpful exploded view diagrams and order
entering your full model number here.We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.