Begin by un-clipping the motor housing cover.
There are a total of fourteen clips. Five on each of the long side, and two on top and bottom of the housing.
The plastic of the housing and lid is very durable, however the thin plastic where the clips enter is an exception. The odds are that you will crack some of these areas as you remove the lid. Do not fret, as the lid will stay closed even with just a few of the clips. The fact that there are fourteen speaks to the over-engineering at Mercedes Benz.