I own a 2005 BigHorn 3200RL fith wheel. Today I emptied the black holding tank. The flush valve pulled very hard, but did finally open. I then operated the sani-flush for a couple minutes and shut the valve, allowing a few gallons of water to accumulate in the tank. When I attempted to open the valve again to empty the final rinse water, the flush handle was jammed so tight against the back wall of the little compartment where the flush handles are housed that I could not get my fingers around it to grip it. I got so wrapped up in fussing with the flush handle that I forgot that the water was still filling the tank through the sani-flush system. Eventually I was able to pry the handle out far enough to get a hold of it, just as the cable broke, right at the handle. Then my wife called out the window to tell me that the rug in front of the toilet was wet. That reminded me that the water supply to the sani-flush was still on. So now I have a black holding tank with 40 + gallons of fresh water in it, and no way to flush it out. I am set up for the season at an RV park, and my holding tank flush hose connects to the RV within 10 feet of my neighbor's screen tent. I just had all three holding tank valves replaced 2 years ago because they were all leaking, so I know that the RV repair shop will not service the holding tank until it is empty. Any suggestions as to how I proceed? No portion of the flush valve cable is accessible. It looks as if the bracket that secured the handle to the rear wall of the access compartment has torn loose, but has left less than a 3/4 inch hole. The cable is dangling somewhere behind that wall and there is no access through the under belly. Can anybody provide a drawing as to where the flush valve is located, so I will know where to cut through the under belly to access it. I assume I will need to replace the entire cable, from the flush valve to the compartment that houses the cable handles. Thanks, Bill in Michigan