Degasser came. Released pressure, pumped back up and voila, she's back. Now I have 2 Discos because when my Disco stopped working I immediately ordered a new one because it is my wife's go to squirrel eliminator. Thanks to all the member advice.
Older Disco showing full tank just gives a spring noise when fired. No air. Pellet does not even make it out of the barrel. Really love this rifle and would love to get it operating again.