Glenn,

If it's like the 300E, you have to unhook the door pull rod and slide the small handle assembly forward and out. For me, this was the key to get the door panel to come off. The panel has clips that require you to lift it up and out.

Definitely search the archives as well for more detail. Good luck.

__________________
D.H.

04 ML500
02 E430

Experience is something you don't get until just after you need it.