I have a broken / loose air vent mechanism in one of my rear passenger air vents (the ones on the back of the front central arm rest). It works going left/right, but not up/down.... I have no idea how or why this happened as obviously I never sit in the back! But the car is heading back from its lease soon, so I need to get it sorted. Has anyone had experience with this before? Any thoughts / ideas on cost? Also, do I need to be getting this done through an Audi dealer garage, or can I go indie? I've always had it serviced at Audi as I believe that's part of the lease agreement, but not sure on repairs like this.