I've noticed over the past 3 weeks that the spa has been losing about an inch a night, about an inch below the spill way. I have shut the valve off the spa a couple days ago and it is slowly losing water. Called my original PB and they think it might be leaking around the main drain(s) which I have 2 one on bottom and on side of spa or even around the spa light pipe. Any suggestions, ideas to check? Day 2 of shutting off the spa and it's down 3-4 inches.