I removed the rear view mirror this evening. One of the three screws was slightly loose (about one turn). There is about 5 mm of movement between the courtesy light panel/headlining and the roof, but I don't think this is the rattle. When I reassembled the mirror (I was worried that might be difficult, but I had no problems) it seemed much more solid with no play between the mirror foot and the courtesy light panel.
We'll see tomorrow. I've got about 300 miles of driving to do, that should show up any more problems. There's definitely a faint dashboard rattle...
[Edited by jjrodger on 06-14-2001 at 05:34 PM]
1999 SL 500
1993 320 TE
1986 500 SEC