One common problem with these machines is dripping from the outlet.

Before attempting this repair, it is worth de-scaling the machine first, as that can often cure it. De-scaling solutions are available on-line or in hardware stores, and are easy to use. You can also just use a vinegar and water mixture.

The parts involved are a conical valve spring, a brass collar and a silicon rubber valve head. The valve stops water coming through before there is sufficient pressure. Sometimes the collar is missing, they can corrode away over time.

The second picture shows the 3 parts assembled correctly.