On a slow connection so I didn't look at pictures.
I had a 2007 and you had to lift the bed and it was right next to the pump. IIRC there was a short section of tube then a T where and one side went to the pump. Valve there. Dumped out right over the sewer discharge.
I took and put a valve on the drain line outside then left the inside one in the open position.
If you don't know Forest River has a forum that might be a better help for you.
2016 Bounder 34T Anniversary Edition