While making a U turn a few weeks ago a loud noise was heard in the front left corner. Sounded like a gear skipping and something then rubbing. Has happened several times since then but only when turning sharply to the left. The sound varies some and today it was a whinning noise like that of a childs top when it is first started spinning. Short duration, a second or two and happened when turning left a 20 mph. It was at the dealer for 2 days for this problem and the techs never heard it once, so nothing has been done. What could this be? Bearings? Constant velocity joint? Something with the AWD system? I hope it is nothing that will leave me or my wife stranded somewhere this winter. Would appreciate any feedback on this, even guesses. Thanks, Tom.