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That's how it usually goes with complicated plumbing matters. The last time I had a plumbing problem, it was with a pipe that was leading to my bathtub. I live in a condo, and the pipe was inside a cut out and covered wall, providing easy access.
It was copper piping though, so there was no way I was going to be able to do anything to it. I'm just glad I noticed the problem before it got out of hand.