My daughter's AWD has developed a noise (whine?) - the pitch is directly proportional to the speed - indicating that it has to do with something in the "driven" part of the drivetrain. It doesn't change when shifting gears or engine RPM or steering position. I haven't started real troubleshooting yet, but suspect it might be the transaxle since the noise seems to be coming from the front and center. It seems unlikely to me that both wheel bearings would begin to fail simultaneously, but would like to hear if anyone else has had the same issue?