Resolved
I pulled into a Camping World shop and it took two service repairmen to trace the lines and locate yet another hidden valve located behind the screwed in access panel below the shower, hidden by the heating ductwork. The valve is to close the line between the freshwater tank and pump during winterization. I'd think it be common sense to locate the valve behind the screwed in access panel alongside the pump. Of course the owner's manual is useless and mentions nothing about any valve locations. Thankfully my maiden voyage was saved. Thank you all for your posts and help.
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