I had the burn element replaced in lower oven. 6 mos later not lighting. Technician wires burned connecting element to bake valve. Fixed but still won't go on. All burners and upper oven still work fine. Technician said maybe bake valve is bad but cannot get park, no longer available. Any ideas? Could he be wrong as he did not see burned wires until after he said bake valve was the problem. Technician although was nice, seemed inexperienced.