My W140 had a problem with the trunck lock. This is the story:
When I push the trunck unlock button the trunck open BUT the handle does not come out. I then close the trunck and the vacuum does not close the trunck. I have to slam it and the trunck close. I can hear sound from the trunck when open and close.

From this another problem follow. I use my keyless to lock and unlock the doors but it won't lock. However the door will close (ie the vacuum works here).

I have open the trunck cover and don't know where to start. Please help.