I have a Nutone combination Fan/Light in my bathroom. Out of the blue, the light does not work but the fan still works. There is a separate switch for the fan and another for the light. I checked the bulb and it is OK. I checked the switch and it seems to work. I detected voltage on the hot wire coming into the light socket in the fan housing. All wires appear to be connected. I rubbed the contact point between the ground on the light where it meets the fan housing to make sure that had a good contact. Could this some how be related to losing the ground? If so, how do I go about getting the ground back again?