OK, I went to Manassas Chrysler yesterday to get my oil changed and my new Rotex front brake pads installed and I brought all the paperwork with me regarding the droning sound. They said they couldn't find anything wrong - again. The tech didn't even look at the paperwork and the service manager I was dealing with said the transmission control module wouldn't cause any droning sound. They checked Chrysler for any mention of it and found nothing. He also said they can't access the Mercedes database even though they are the same company. I'm getting fed up with the hassle. I'll take my car to a new dealer closer to work in a few weeks when I have time and try to start the process all over again. Maybe I'll get someone who's willing to work with me.