Rule #1 You never take a mercedes benz transmission problem to a transmission shop, that doesn't totally specialized in mercedes benz transmissions. If you do you are going to loose every time. An honest transmission shop will turn the work away, because of the different intricacies of the transmission. A mercedes shop has all the equipment to hot test them, and there good before going back. The post that said bypass that transmission shop was giving the strait truth on the issue. Don't ask me how I know!