So I was dumping my black water tank this morning. Everything was fine until I tried to close the valve. It was stuck solid in the open position. Would not budge a bit. I tried spraying a little WD...
I've never been a fan of the remote dump valve operators. I had a similar problem on our previous 5vr and it turned out that the grub screws that hold the cable came loose. I had to cut open the underbody cover to get access to the valve and repair it.