Ugh...timing is everything...I just got my car out of the shop today after they completed the PI0137C bulletin (new type of differential fluid with additive already in it and the rear axle seals/axle nuts) and reprogramming the EBCM with an ABS update.
They didn't mention the new bulletin today, but they probably weren't looking for it either.
Time will tell if the groaning comes back or not. At least I know there is new bulletin out there.
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