Question: Does your unit have a shower? If so, and the gray tank is indeed full, that's the first place it should show up. That's the lowest drain relative to the tank. Are you sure it's not just your sink that's stopped up?
If the valve is stuck open, and there is an "obstruction" there, it's unlikely that's water-tight. I would assume that if the gray tank is full, and the valve is unable to be closed, at least SOME liquid would be getting by the obstruction. Maybe not though...?
Either way, I would be ready for water to come out of the gray tank when you go taking those 4 bolts out... just in case...
Grumpy's right, replacing that valve isn't difficult in itself. But if you have a backup or obstruction, it can definitely get interesting...
ETA: Sorry, I see it's a fifth wheel; your shower might NOT be the lowest drain...
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-2018 Greyhawk 29MV
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