As Dan said, try operating them before you shoot up distress flares. Take a look in the front compartment on the door side and check the level of fluid in the hydraulic reservoir (look for any leaks there, too). The battery is below the hydraulic pump. Most likely there will be valves like in the photo of mine. Make sure they're open all the way (turn counterclockwise). Then press the switch located near the pump or use the one inside the trailer (be sure nothing is in the way of their travel paths). Most likely, they will work. You may notice some start and stopping, but that's how they operate if all valves are open at the same time.
The labels on the valve photo were added after the pump photo was taken.