We generally keep all spare parts availability from 5 to 7 years. So if your housing is less than 5 years old we can generally completely repair it, if it's between 5 to 7 years old, you should contact us to confirm if we can repair it, as some parts may no longer be available, and if housing is over 7 years than chances are we will not be able to repair it, if major parts are defective. We can only offer generally o-ring overhauls and testing, but you first must contact us to confirm...