I remember reading about this identical problem about 3 or so years ago. So I know the solution is somewhere on the site. Have you tried a search and what key words did you use. It may take a lot of reading.

If and that is a big IF I kinda remember something about the person taking out the grille like when you have to tow the car. There is a clips on the sides of the grille. They then could get at the latch. I think they had to take the latch apart from there.

I assume you have tried your key in the drivers side doo and that did not work.

If this was a real Mercedes you could use your vallet key to get in. Because of this issue I always leave my doors unlocked when I store the crossfires for the winter. Never seem to have this problem with the older Triumphs -- Tr6 and TR3A. Except for the TR6 in the past before I got smart and put a manual emergency release on it I had to drill a hole in the hood to get at the latch. That hood opens from the back.

Come to think about it that was THE after the fact fix for this issue. The guy ran a wire so he could get to it from under the car. Similiar to what I have on the TR6.

Hope this helps.

Joe