Replacing the transmission has little or nothing to DO with the Trans control unit!! The control unit is a small computer that controls the trans. IF the replacement transmission was working fine & now the car is out of warranty the only way that you could get any FREE work done IS "Goodwill".
Both the old trans & new trans is susposed to hold in gear when cold!! MB has done this since 1990 on all gas cars.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)