Our tank is under the bed. Has a blue pex drain line that protrudes under the motorhome behind the right rear wheel. Can't remember but I believe our valve is in the bay behind the right rear wheel near the water pump. I honestly cant remember if there is s valve or a cap on that drain line. hadn't looked at it in a while. You should have 3 lines under the mh. Hot and cold low point drains, which just have caps on them, and the fresh water drain. Low points are usually next to each other. If I were home I'd snap a picture for you. You should be able to follow the drain line up. There are a few owners on here with that model. Maybe they'll read this thread and help you out better than I can.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.