PeachParts Mercedes-Benz Forum - I need to know the secret to removing a door-panel

This is my first post on this forum in quite awhile as I'm mostly into W123s, and don't usually mess with the newer Benzes. but a friend recently acquired a 2000 C240 sedan and promptly broke his driver's window switch. Unlike my vintage diesels, it looks like the driver's door-panel needs to come off. So I would be very grateful if someone could let me know the hidden fastener locations.
In addition to the plastic 'U'-trim at the door-latch. I believe there are one or more hidden screws that have to come out in order to allow the panel to slide up and disengage from the inner door-skin.
Possibly one behind the tweeter-speaker cover at the window-frame, and maybe one behine the airbag-badge or armrest too. But I'm reluctant to pry on any of these for fear of breaking some expensive bit of German plastic - at least until someone here can confirm that I'm on the right track.

Thanks in advance & happy motoring, Mark