My '03 E55 has a faint but noticeable squeak when I accelerate hard from a stop or near-stop. Not noticeable with windows up and/or stereo on, but with windows down and stereo off, an annoying squeak. Has anybody else had this and had a dealer diagnose and fix it? I'm bringing my car in for service this week and would like to give the dealer some "guidance" if you know what I mean!