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I'm not sure on the 2006. My 2005 PT has a fresh Water Dump "switch" in the Wet Bay next to the Black and Grey Tank dump switches. I assume you don't have that switch or you wouldn't have started this thread.
The other place to look (at least on the '05) is in the compartment where the water pump is located. On my Coach there is a removable panel on the rear wall of the basement compart just forward of the Wet bay compartment. In that space is the water pump, redhat valve, filter for ice maker, and some "low point" drain valves.
I looked in the 2007 Marquis owner's manual - but it did not show where the fresh water tank drain switch/valve was located... I don't have a manual for a 2006.
Look under the coach, there will be 2 small pipes sticking out the bottom, one for the cold water and one for hot water circuits. Then look in the compartment directly above and trace the lines.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
Just to add (Jim's post reminded me to say...), on my '05 the fresh tank drain is the same type valve used for dumping the grey/black tanks - it's a large 3" motorized drain valve.
Linear Mode
