We had the same issue in our 2009 345RET first time of use. Found two small pinched holes, which we repaired with the patch kit. We called the dealer, they told us to look for holes. I pulled it outside, blew it up, used soap water to find the holes. They were located opposite corner (same side) from the pump. Patched it up, so far it's holding. Just watch how you fold it up.