I have a Jenn Air wall oven combination unit (microwave and oven over under). The microwave lights have gone off (like it lost power) but the oven lights are on. When I turn on the oven the microwave comes back to life. However the oven does not heat when I turn it on and even though the microwave lights come on they are dim and when I try to use the microwave it acts like it is operational (the plate rotates etc) but it also does not heat. So bottom line is neither unit is heating although its clearly getting power. I am think a board went out on it but need advice. thanks