If water only leaks when the drain valve is open, then you have a leak after the valve, and the only way to determine where and what is leaking is to drop the coroplast. It's likely just the 1 1/2" drain pipe or one of the fittings that is leaking, so should be a simple fix.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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