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I have a similar problem, in my case one of the blades has a spot of inter-granular corrosion causing the blade to grow to the point of just touching the shroud, the corrosion is easy to miss, it looks like a bump with a small crack in the center. Check your fan with a flashlight for corrosion, you can also feel for a bump. In my case I am waiting and watching, since it rubs every now and then and just barely with no real damage to the shroud, one day I will replace the fan.
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