Central Locking Problem

[Spoonman]

The central locking on my C180 hasnt worked for a while. Ive tried to find the problem but I cant seem to fix it. When I lock/unlock the car the rest of the locks move slightly but dont lock or unlock. Im guessing that means its a problem with the pump. Has anyone had a similar problem and know a likely fix?

[lamf]

had the same problem. on the passenger side of the trunk in the there is a place where all the vacuum tubes meet. in my c36a tube was off