New to the Benz world, ripped off by a guy who sent me an un-useable set of dvds off ebay, said to be service manuals. Anyone got an ideal on a buzzing noise seemingly from the inside rear view mirror? As a long time mechanic I'd really like some factory manuals or suggestions as I'd really like to get to know my 1996 300 Diesel before it needs me to.................. I'm freaked out because I'm a manual freak and all I currently have is a Pocket Mechanic for the W210 series, thanks in advance.