I have a 2002 Allegro Bus with HWH 610 Series computer controlled leveling system. We arrived at our campsite and everything looked reasonably level and solid. I put the jacks down, went outside and saw that the right rear jack had pushed down into some soft sand. The jack was extended very far out and the right rear tires appeared slightly off the ground. Quickly retracted the jacks (worked fine), moved the bus, filled the hole, put some blocks under the tires and the jacks. Went to level again, pressed the ?hyd? button twice as usual, system dumped the air, but the jacks would not extend and the travel light stayed on. Tried to manually extend but nothing would happen, system stayed in travel mode. I did notice that when I pressed the hyd button I could hear a slight clicking noise coming from under the lower left dash area and there is a HWH box under there. Any ideas on the problem and I know, I know, I should have checked the site better and placed blocks at least under the jacks. Thanks again for any solutions.