Probably something worked loose. Like light bulbs or screws that hole the light fixtures around the bulbs. or housing cover screws. Last thought would be the socket (if that style has socket?) the holes the ceiling fan up. after years of use it rocks back and forth creating wear and the movement may be the noise you hear. I dough you could lubricate the bearings. as Stated they are usually 99.9% sealed on all ceiling fans made since the 70's. I would make sure every thing is tight before I started disassembling it.
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