I'm sorry to hear about your tank leaking. I have not had a problem with my AirForce Condor, but I would suggest sending the tank back.Call them.
The only problem I had with my air force gun was a leaky pressure gauge, I called activated my warranty on the phone and they sent me a new gauge free If leaking from valve same thing I would Imagine.
I am interested in the Texan. I am in the process of moving right now so I must put off a purchase. If you have a thread on it please give me a link.
You can register your airforce warranty online. They will take care of you but it may take some time. Most likely they will want you to send the tank in. Took about 2 1/2 weeks in January to get my condor SS tank rebuilt including shipping time.https://www.airforceairguns.com/Articles.asp?ID=261
Sarge, if you have the problem again, give me a shout by PM. Such a powerful system can have issues in the valve. the repair is simple and straightforward, and I will talk you thru it by phone.Howdy Doug!!!Knife/Mike