GE Double Oven- No Bake Heat, Convection Works

I have seen similar Posts, but not quite the same. My mother’s GE True Temp Double Oven (Model # JTP56W0A1WW), will heat to only about 200-300 degrees on Bake for BOTH ovens, but the convection heat works fine. I did notice the top oven door doesn’t close quite all the way, but she said it’s been that way for years.

:confused: Does anyone have any idea what may be the problem here? Replacement part ideas? I’m not a technition, but pretty good with electronics. Just a worried daughter trying to help fix this to save her mom the trouble and money. Any help would be appreciated. Thanks!