Check and make sure the bowden cable is properly adjusted. You do not want any preload on the cable portion. Pop off the ball and see if it is lined up, if not, adjust it with the cable nut.

IF all is well in the above area, you may have a problem with the clutches in the bottom drum (K2) I think.

__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS