FX Maverick Valve issue

The same thing happened to mine. It turned out to be the O ring in the valve pin cap. I tore mine down all the way except the block. You may get by with just removing the plenum. You will have to be cautious because the cocking rod runs just below and to the side o the valve pin cap. The valve pin will come straight out once the cap is removed. Be watchful for the valve pin spring when you take it apart.
Good luck.
 
Makes me think it's something with the valve
I am going to call FX tomorrow. It
The same thing happened to mine. It turned out to be the O ring in the valve pin cap. I tore mine down all the way except the block. You may get by with just removing the plenum. You will have to be cautious because the cocking rod runs just below and to the side o the valve pin cap. The valve pin will come straight out once the cap is removed. Be watchful for the valve pin spring when you take it apart.
Good luck.
Thanks. I broke it down already cause I had orings from fx alreadu but the orings looked good.