I would check the relay switch on the pump motor before messing with hydraulic lines. There will be two big terminals that need to be jumped on the switch. If the pump motor runs while jumped, then the relay switch is most likely bad. Also, there are two small terminals on the relay switch, one is the trigger terminal, the other goes to ground. The trigger wire terminal should have 12 volts when pushing any of the retract/extend buttons inside coach. When pushing any of these buttons, and there still is no power at trigger terminal, then problem is upstream from relay switch. Hope this helps.