Back flow valve location
My gray water flush leaks when in use. I've been told it is probably a bad back flow valve and that access to the valve is through an access panel located above the sink in the bedroom. Even though this is where the leak appears to be, there is nothing behind this access panel except water connections for the shower. Being a 2014 DRV ES 38PS4, ours is a somewhat unique floor plan which may be why the valve is not in the normal location. I would appreciate any thoughts on how to get to the valve. Thanks.
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