I am a property manager and found that the light under the microwave did not come on. I removed the long thin glass cover to remove the light bulb but discovered no bulb. Also I don't see any threads for a bulb to be screwed into. Almost looks like the bulb that was there was broken off, but there are no remnants of any bulb parts. I'm stumped. I need to know if this is a standard screw in bulb with a small or medium base and if it is how do I remove the broken base, the oven is unplugged. I was going to use a pair of needlenose pliers to unscrew the base, however, there is nothing that I can see that resembles a light bulb base to grab with the pliers to unscrew. Do I need to remove anything else and what type of bulb is used as a replacement. Any help here is greatly appreciated. Sincerely, Mark