Hi Alex, Craig
Have experienced the same air leak through the mast foot of a 2016 Fanatic Ray Air Premium just the day before. Have been very surprised because it appeared out of the blue, after a few hours of smooth riding without any wear and tear or bumps.
In my case, the air seems to leak from the upper area of the screw, somewhere between the layers that are glued together there to seal it tightly. It appears to be a rather large breach since air comes out with noticeable noise and the board losses pressure visibly. Is this similar to your situation?
I am kind of confused on how to fix it, so I would very much appreciate if you could share if/how you progressed with your repair.
Thanks a lot!