Under burners was literally igniting. Will replacing the switch harness repair this problem and will it also cause the oven to work again?
The switch harness would have no effect on the unit lighting under the burner. You will want to pull the burners to make sure that the burner heads are clean. Also check the orifices to make sure that they are clean. This issue would also not cause the oven to not work in which you will want to check the igniters and the oven safety valve.