Sorry, to be discouraging . . . but there are no 'small issues' under concrete. This would be a small issue on an AG pool, but in your case, not so much.
Google has a pretty good picture of your pool, and it looks like it might be possible to tunnel under your deck. But that's the only repair option I can think of, that doesn't require cutting concrete.
(The picture is not really big enough or hi-res enough for me to see what's going on. You might want to replace it with a couple of hi-res pics, including one looking into the return.)
. . . membership upgraded.
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