Had the same problem - then realized that the water was only there after I had used the black tank flush - the back water valve is up behind the shower (WHY???)
also the inspection hatch for the shower head isn't big enough to get to the valve - had to cut a bigger inspectionj hole - found the fittings not even finger tight. Some of the 'old world crafstmen" need to go back to the 'old world":
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