I would think aamco should have scanners that can clear the codes. It does require either Mercedes system, Snap-on, or others like Carsoft interfaces.

If they tell you they cleared P0xxx codes, then that is not good enough. The codes they need to clear are three digits such as 012, etc.

If you search for conductor plate, you should find many answers. Your original transmission might have that part failed. The part has received 3 - 4 updates.