Door locking and top operating system failure

I had this problem, the pump is very expensive however if you can not hear the pump in the car it is the motor that has gone down.easy to repair, I got the motor out of a 12v tyre air pump for the cost of £6. Be very carful when you take the pipes off. in my S class there are two pumps, the one in the boot is for the soft closure doors and there is another one under the back seat for the central locking. Hope that is of some help