FX Bobcat MK2 Leaking Air

I was playing around with my FX Bobcat MK2 today, when after a few magazines I could hear air leaking into the barrel. I added some more air but the leaking continued until the air tube was empty. It's not all that big a deal no matter what the fault is, as the gun is still under warranty for a few months and AOA is just across town. But if I could fix it myself without to much difficulty, that's what I would rather do. So, anyone got ant idea what might have failed inside the gun and how do I fix it?