Hi Mark
If you have already attempted replacing the 014 o-ring in the manifold and the 017 o-ring in the cylinder. And you are confident that the leak isnt being caused by you over pressurising the bolt (check by setting the hyper2 to 3.5 turns) and still cannot resolve the issue.
Then contact the office to arrange sending the gun to me for repair.
0208 649 6330
Thanks
Ash Chaplen
Technical Support
DYE Europe