Hi, I have an air leak someplace in my inground pool. I am hoping that it is aboveground. I have placed duct tape around most of the PVC fittings and placed heavy plastic around the valves. So far, no luck. I recalled reading on one of these posts that sometimes air leak may occur at the pump. I don't remember the specific details. Can someone enlighten me as to what to look for in the pump? Thanks in advance.