I've been out of town for two days. As per Dennis' advice I added water to try to get the level to 2' but only got it to 19" before I had to go out of town. It's gone down 1 1/2" in two days so it seems that my leak might indeed be on the side in the 12" to 19" (from bottom) level. I'm going to see where it seems to settle at.
Thanks, Al - I'll look at your thread over the next couple of days ...
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