2015 Sunset Trail Reserve Shower won't drain
Just bought this trailer. Shower won't drain. Have emptied grey water tank, taken off p-trap under shower, and tried removing vent under sink. Once the pvc pipe heads down toward the ground, water flows back into the shower. The dealer we purchased from said there is only one grey tank. The gauge shows the tank is empty; however, there is a light for a second grey tank that shows full. Do we have a second grey tank? If so, how do we empty the tank? If not, any ideas on how to fix the shower?