I have an AquaGenie that's leaking on the return side. There's no way to definitively say this but water falls to the bottom of the return. I made a blank to cover the return and pumped air into it. The air leaks but still not 100% certain. The winter prior water got into the return so my guess is it froze and cracked although I can't see were. The AquaGenie looks to be quite difficult to replace. Any ideas that possibly I've missed?