Not a mechanic, but I've changed hubs before, so I know the sound when one is starting to go out. Ours is, but the real question is "Is it covered?" We have a vehicle protection policy and part of it reads:
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Final drive and axle housings and all internally. - lubricated parts, flex discs, axle shafts and bearings, universal and constant velocity joints, drive shaft, center bearings, drive shaft yokes.
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The key word being "bearings". Does that mean the hub bearings are going to be covered or are they more considered normal wear & tear like tires?