just acquired 2003 A4 Cabriolet. 32,000 mi. Had dealer fix cowle "squeak" prior to purchase (this was when going over bumps at low speed). they were able to to this. Now 2 weeks in....it's got a sort of "rattle" from the right (passenger) side cowle or windshield, or dash area, when going over bumps at low speed. Almost seems like it comes from the cowl joints...or conv. top joints. "help" . I can't have this from a newly purchased car...and hope to live with it. Advice????