For some unknown reason, my taprite regulator isn't working properly. It's under a year old. The minimum psi I can set it is 8 psi while the max is around 28 psi. I am unable to turn the screw below or beyond those numbers. I'm thinking it might have gotten something in it, but I'm a little confused since I have a 4 way manifold with check valves. I bought it from Keg Connection- do they offer any kind of warranty on something like this?