I had the same issue with mine ... if you can undo even three of the four securing screws (the fourth is at the back and a pain to get to) you should be able to get one of those tube extender things to spray CRC, WD-40 or one of the other spray on lubricants in there. Mine was screaming like a banshee and has never done it again. If it won't shut up, I guess you're up for a new one.