Thank you for the responces. Someone suggested cutting the pipe between the valve and blackwater tank Then use a rubber pipe coupling with a coupling strap at each end. By cutting the pipe there, you can remove the pipe piece and valve together. Remember to cut back the black pipe piece about 1/4" to allow for the middle stop inside the coupling. It may just be toilet paper piece that got lodged in valve. An easy fix.
I also, cut the floor board in the underbelly storage above the valves instead of removing the underbelly panels. The gas lines are against the panel. This allows you to work standing up instead of lying down reaching up and maybe getting wet. Screw a couple of pices of wood across under floor board to hold the pieces you cut out in place. Now you have access for the next time.
I love this forum for answers.