Last season, we noticed water levels that lowered, and problems vacuuming, so figured theres a leak somewhere in the system (which we're about to start inspecting areas now that we're getting ready to open. We noticed the liner seems to be sucking into and wrinkling around the edges of the jet return. What might cause this?? Is it possible to remove the water return jet and smooth out the liner, then reattach the jet?? But even if that's possible, we first need to figure out what caused this in the first place! Thanks for your help!