FX Timberwolf, need advice repairing a leak (somewhere)

Guys I’ve finally found a beautiful example of the FX Timberwolf 2-shot PCP. Been wanting one for some time. But I notice a bit of air in the face when I shoot it. It’s not very strong, but it’s there. Can anyone with experience with this rifle help me out? I don’t want to mess it up, but i need to fix that air leak. How to tear it down?
thanks,
Darryl