I have an L4330 4x4. After getting stuck in the mud and being submerged in water, I lost power steering. The wheels on free to turn when the lines are removed, so its not mechanical. The pump seems to be strong. I think in air in the lines. I did loosen and bleed all lines and saw air in the fluid but don't know how to correctly bleed the system. Does any one know how or have any thoughts on what else it could be?