87 w126 cold weather gremlins

[metaprinter]

1 - My 87 420 SEL has a rather bizarre issue. If it's 30 degrees or colder outside I have to unlock my doors using the trunk or passenger door otherwise my factory MB alarm goes off! I've never taken apart a MB door lock tumbler, but i'm guessing there's a resistor or something in there that's not getting a good signal when it's cold. any advice?

2 - The sunroof rattles like theres a little screw in a rattling in a tin can. if i put my hand on the headliner (on the sunroof) even just lightly, the noise goes away. How hard would it be take the sunroof apart to find out what the heck is in there making noise?

Thanks, any help is appreciated.

btw i have 71k on this badboy now and it still drives like a dream. First time benz owner - 1987 420 SEL