I have a ceiling fan from Westinghouse that I bought at Direct Buy and can't find the name or serial number on the unit. Both lightbulbs have now burnt out and I desperately need them changed but for the life of me can't figure out how to do this. The fan has no entrance from the top beneath the blades and the housing where the bulbs go is screwed on with lots of screws, and there are pull tabs and buttons I don't want to disturb. HELP. Can anyone tell me how to fix this thing, I need light!