The door panel is tricky. You have to snap some of it off with a fork tool. There are tabs that have to be slid upwards on the seat adjustment wood and there are bolts behind that.
On the click, if it is an axle shaft, it could be making noise when loaded only.
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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope

1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM