I have s 02 C320 wagon with 32000 miles is just about ready for A service(1500) to go. My AC has had a problem with the Musty smell that several have posted about. My dealer has been very good about cleaning it each time I complain about it (3x's). I am wondering if a more long lasting fix can be done. I don't mind having the dealer fix it but when it goes off warenty I don't want to have to pay to get it fixed every six months or so. Ideas??? Can the whole duct be changed? Would running this up to a regional rep help? (dealer has been very good) Thanks