Hey, I said HEATED pool. Haha.
But seriously, as crazy as it sounds I've found 2 or 3 leaks for friends doing this. And, yes, a mask and snorkel help! Set the wheel/tire assembly on a chair in the shallow end so it's only 2 feet under water. Then you just stand on your knees with a snorkel and mask. Seriously. It does work.
Smilin' at all of ya. Happy New Years.
Scott