Donkeyface, another thing I should mention is the original scan tool used by Chrysler on these cars are now hard to find and expensive to purchase. The correct scan tool is a DRB III with the correct card and cable. These have been replaced years ago at all Chrysler dealerships to newer tools and the new tools can not link into the Crossfire system. The best tool to use is the DRB III to scan your transmission. It can find both electrical, communication and mechanical problems in the transmission. and it's controlling modules. HOWEVER, it is unlikely you will find a shop with a DRB III scan tool and the correct cable with updates and that is why the best you can do is scan the car as a 2003 Mercedes SLK 320.