This tranny uses a vacuum modulator to control shift QUALITY. The bowden cable is used to control shift points.
There is also a valve on the rear of the tranny with a single wire going into it. It is for kickdown and first gear start with the shifter in the 'b' spot if it has this.
I would start by topping off the fluid to the bottom line on the stick when cold and unplugging the small valve. IF this cures the problem, it may have a switch under the gas pedal sticking or a problem of the sort.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS