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I was just reading this thread for the first time (because I don't have the noise). I couldn't help but think it was tire, or wheel & tire balance related. If there is an imperfection in the tire or it is out of round, or the balance is off, it could cause what you are experiencing. Sometimes if that type of problem is on a rear wheel you don't feel the vibration.
I know the dealer SHOULD be the one to diagnose it, but I often find myself (more patient, more concerned) doing their work for them. Here is my suggestion to the OP: switch your wheels front to back. This will eliminate wheels and tires as a possibility if the problem remains in the rear. It is a very easy thing to do yourself, consider it quality bonding time. And, who knows, if the noise moves, you found the problem.
HTH.
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