I finally found them! I had to pull out the power center so i could slide my hand behind it and reach around the vent ducts. Then I could just reach them. This location is totally ridiculous so i ended up mounting 2 brass ball valves to the drain lines that I can open and close from outside the coach. Once they were installed I left the inside valves open and then reinstalled the power center. Now when I want to drain the system I simply reach under the coach and flip the valves.
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