You might also check to see if the fan blades are clear. If a mud dauber or something else attached something to a fan blade it could be out of balance enough to be affecting the fans bearing.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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