Man - there HAS to be a manual on this....
Or - a video or something.
Oh... wait... in the stickies... all huge.... been there for years.... https://mcarterbrown.com/TF/CCM/CCM%2...r%20Manual.pdf CCM Regulator Tech Video - YouTube
Do you mean it is leaking out of the cut out next to the adjustment screw? If so - replace the 'piston' o-ring on the regulator.
The specific size is in the manual above.