GE Oven not maintaining Temp

I have an old GE XL44 pilot system that is not maintaining temp. I can get it up to about 125 degrees but the gas valve shuts down the burner. The pilot is strong. But I fear that there is some issue with that sensor. I polished it up a bit with some sandpaper but I can't get it to change its behaviors. I really don't want to dump $200 in to a new valve. Is there a way to adjust the thermostat? Would you guys say I have a t-stat issue or a valve issue?

Thanks for your time!

Matt

via GE Oven not maintaining Temp
by mountainbiker33