First, I would find out where it's leaking from. If air is leaking out of the barrel it is most likely the valve stem. You can put a balloon over the barrel and leave it to see if it fills with air. You can do the same with a balloon over the fill port/end of tube to check that. A little soapy water over the hole drilled for the regulator will tell you if the reg o rings are the problem. Then just decide if you want to fix it yourself or send it out to have it done. There are a bunch of wildcat videos on the tube showing how to take apart the rifle. I've decided that from now on any leaks or smallish problems I have with my guns I will try to fix myself. It saves money and doesn't hurt to know your gun.
You just bought it? I agree if you just got the gun new it shouldn't be leaking yet. You might have sent it back for warranty work though?