My LBS checked this and other things, which helped, because I knew the B screw adjustment was proper. It's trial and error, process of elimination. Your LBS may not be able to find it without help from you for a few reasons. In the end I found these noises by paying attention, trying different things. One issue is that I wasn't hearing these noises in the parking lot, I was getting them 1 mile into a three mile climb, and then for the last 20 miles of a 50 mile ride. I finally figured out the rear hub and seat post angles in my driveway one night. But it did drive me nuts for about two weeks.