It would make sense that builders would follow a consistent pattern in the way the locate pipes . . . but in my experience that's not true. I've seen pipes run just about every way they could have been.
About the only thing you can rule out, is any path that would have required the builder to cut through rock.
You *might* get some indication of how it runs, if you dig down and follow the line for 6 feet or so away from the equipment pad.
One caution: the MD pipe COULD run under the entire pool, to reach the drain. OR it could run around the walls (from either side) and then drop under the pool. For several reasons, there's a fair chance that the section under the walls is the location of the leak . . . and fixing a leak their is a major task. Usually, it's easier to run a new line.
One suggestion: verify that your pool's hydrostatic pressure relief fitting and valve ( IF it has one ) is not the source of the leak.
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