Did you ever have this fixed? I just bought my 2012 premium used with only 18,000 miles on it. It has the same issue.Looks like my 2012 Regal Turbo Premium 1 is starting to experience this at 12,000 miles. I have had at least four instances recently when I first back out of my parking spot in the morning where I here a high-pitched belt squeal and can feel some associated wobbling/vibrating coming into the cabin. It disappears after going into drive. I was going to wait until June to do it with the oil change/ state inspection but may make the appointment sooner. It only happens after the car is completely cold going into Reverse the first time. Weird.