How can I fix my grimebuster 2200 !!??

It seems to be a design fault with this model the steam has stopped going up the tube and upon taking it apart the plastic has all chrystalised ! We need a new plastic box ( where the connection goes into it ) and new steam jets that fasten onto the box !! I wouldnt mind but this has hardly been used and has stood hidden away for 2 years since it broke. Can any one help ?