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AC belts have been known to jump a rib on the main pulley some times causing a squeaking noise. Happened to me a couple of years ago. I was able to apply a little pressure to the belt while manually rotating the engine and get it realigned. Haven't had any issues since.
Take a look at the AC belt and make sure it is centered on the main pulley. You should be able to tell if it is not aligned properly. If looks good, the AC belt probably is not the issue.
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