I just fired up my color head in the home darkroom today. After a few exposures, my (old and much) used Beseler Dichro 45S cut out. Fan was fine, no light from bulb. Before I get hopes up that this is as simple as a new bulb from B&H, is there anything else that this may be? FWIW, I didnít hear any popping, the bulb just went out. Thanks so much.