Hi. One year when we opened our pool, the pump was much louder than I remembered it ever being. It turned out that the 2 drain plugs were not tightened into the underside of the pump housing. When I inspected the plugs, based on a recommendation from this forum, the o-ring on one of them was missing. So I got 2 new drain plugs, made sure they were snugged down, and it solved my problem. I hope your solution is as easy.

Tom