The area you describe (near the gray water holding tank) is also the location for the plumbing leading to the indoor shower controls. You could have a city water leak in one of the lines leading to shower faucet. Do you have an outdoor shower? There could be a leak along those lines, as they feed off the lines going to the indoor shower controls.
Dick
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Dick & Jeri in Western MA
2003 2720 SL
2007 Ford Explorer Sport Trac Limited 4x4 - V8
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