If you are going to abandon the line, its more important to know which line is leaking than it is to know *where* the line is leaking. In my case, we never did find where the leak was, we just cut the existing line short of the return and ran a new one. Ran the new line 99% in my yard, with the minimum amount of line necessary running under the concrete. This way next time (please no next time?) I can just dig it out of the yard and replace.
As far as losing water when the return was plugged, our leak did that too. Turned out that the plug itself was leaking, so its very possible you only have one issue. Then again, its also very possible whatever caused this issue has caused another one as well. Plugging all other openings (like it seems you are trying) is the best way to narrow that down.
-Chris
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