Richard,
According to Norgren that is a Freightliner special part. Looking at it, I would bet the the Cclip that hold the solenoid on can be removed, but I would not bet that the valve can be rebuilt.
For a lot of years Norgren was our bottom bidder and a reliable supplier. I never saw the warranty part, but if it had been serious i would have heard about it.
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.