Just to clarify, is it the case that you’re not holding water - it’s draining out and you need to stop that? If so you do need to find the valve or petcock for the low point drains, assuming thing else is leaking or open.
My Tellaro has faucet type petcocks outside, under the coach and you look right at them when you see water draining from under the coach - can’t miss them. My Quantum, however had an inline valve, inside the compartment under the dinette, with a ring attached that you pulled up to open the drain. I probably spent 30 minutes looking at it not realizing that’s what it was - very easy to miss.
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