How did disengaging the parking brake resolve the metal-to-metal squeaks heard from the rear end. They are produce when doors are initially open, anyone seating down on either front or back, or pushing the trunk or bumper. Is there a technical bulletin for this problem for C 240 2003 model trn: 72269604344031?

I just notice that the driver side mirror is self-dimming but the passenger side is regular. Is this observation accurate?

I was inform that the left and right springs inside the trunk normally squeak when someone open or close the trunk.

I am very confident that posting these issues would shed some enlightenment.