The trans computer should reset it's self when good parts are installed but there is some evidence that the codes need reset ( see post 12 )

http://www.peachparts.com/shopforum/tech-help/373358-w210-722-6-there-anyway-reset-transmission-codes-without-multiplexers.html

Somewhere on the net there is a chart showing codes and what clears them. ( Key cycle , scan tool reset )