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I think it's sleeve bearing fans (sleeve right? or is it ball?) that can go dry and squeak/grind. I think you just have to peal that sticker (you'll have to remove the fan to get to the other side) and put a tiny drop of oil in there (like sewing machine oil I think), and replace the sticker.
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"It is the way of man to make monsters and it is the nature of monsters to destroy their makers."
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