Replaced thermostat on rear of oven and that was it. I tested continuity after removal and failed, and also malformed so you could tell was bad. Thermostat on top of unit was good. Recommend buying both when purchasing as found several posts of either failing although the rear was more common - seemed to be different parts but not sure if interchangeable.
We used the oven earlier that day at 500 degrees so assume that's what cause was. We've run self clean in the past and may have been contributing factor.