worcester 28cdi?

apparently i need a new pressure vessel? my pressure valve continually drops to under 1, when refilling the system making the pressure to about under 2 , water comes leaking out of the unit at the back ,bottom, soaking underneath towels. The engineer said i need a new pressure vessel , it also has a bit of rust around the two belts at the front. This system is only just over 5 years old. Is there anything else i can do apart from buying a new pressure ves. and paying for labour. Help greatly appreciated. PS i am pretty handy at fixing things.