W107 door panel comes off like a W123 panel, do a search for instructions.

Get a new check, the old one is probably busted beyond reasonable repair.

however, you may want to take a look at the mounting bolts -- if they are just loose, that may fix the problem.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!