Rancillio Silvia Steaming problem

I have a Rancillio Silvia at work and it had enormous pressure when I first used it.
It is approximately 12 months old and makes around 12 cups a day average.
The problem is that the steam pressure has dropped substantially and it is hard to get good stretching qualities in the milk.
Does this machine need a service, or seals replaced?
Any assistance would be appreciated.
Presto...