Did you find it? My 2607 has two pull valves under the sofa, draining to the outside. The tricky thing on MY 2607 was the water heater. If I drain the WH, the close the bypass, there is still water trapped in the lower pipe between the WH and the bypass valve. The first year I had this unit, this pipe froze, and failed right at the valve. So now I drain, blow-out, then close the bypass, then pump the pink stuff through the system...
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter