So turned on my over the range Frigidaire microwave today and heard a loud pop as well as sparks coming from the right light bulb area where the bottom (of two lights) on the microwave is. The control panel still shows me going from off to light and back but the left light bulb is staying lit (no way to shut it off except to unplug). The rest of the microwave is running fine. Just seems like there is no control to the light bulbs thorough the control. Any ideas?