While we were getting our 5th Wheel ready for our upcoming trip, we noticed that the black tank won't drain out like it used to when we pull the valve level. Our 5th Wheel has got a black water, and a gray 1 and 2 in a compartment at the back of the main front hatch. When we pull the level, the indicator only goes to 1/3. There doesn't seem to be any discharging sound from the hose like we used to hear.
Would appreciate any help on this.
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