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Personnally I don't see how it could be wheel bearings??? If you do a search on here you'll see others with this type of sound, me included at one time. For me and many others, it was the air going over the front bumper and hood. If the gap between the two is not right you will get a humming type of noise that is independent of your engine speed. The adjustment to the bumper is easy to do and will fix the noise. I suspect that while your car was in the shop, they might have loosened the front bumper or hood to look it over. Also, others have found noise from the side mirrors...check this out before you get new wheel bearings. I hope this helps.
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