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Most likely the drain valve has failed (bad seal, gunk in the seal, etc.), You will have to drop the coroplast (or make a window in it for access) to get to it. Get a Valtera replacement valve and you will be fine.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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