W140 - Soft Closing Doors

[Vinalf]

Hi All

I am having a problem with the soft close on my trunk lid. It only works intermittently, leaving the trunk slightly ajar.

Where is the sensor for the unit so I can check and or replace, and how do I check or replace??

I also have a similar problem on drivers door. I already know about restting Fuse 9 in the trunk, but am looking for a more permanent fix.

Thanks in advance.