560 SEL door noise

[Lou K]

I have a 1991 560 SEL with 16,000 miles on it. I am the original owner and in all likelihood will be put in the ground with it. It is truly my pride and joy, however it has one annoying thing that is driving me crazy. There is a noise that originates at the passenger door; a squeak or slight rattle?. It sounds as though the door panel is rubbing on something. I have removed the panel tightened the nuts that hold the wood trim, lubed it with silicone but the sound is still there. Has anyone else experienced this and what have you done to solve this?

Thanks in advance.

Lou K
91 560 SEL
02 CLK 430 Cab
04 CLK 500