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What is below the main floor? Is it a basement? I doubt the drain is causing the problem. Does everything drain well? Perhaps the hot water pipe then? Where is the water heater? The problem with it coming from below is that I guess it could be coming from below to the left, below to the right, or who knows where else?
Have you found any leaking below the main floor? I am getting the impression that there may be a small leak in your hot water pipe somewhere.
Anyone else have any input? Let us know what you find!
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