It might be a hose or more likely the pump or actuator unit. Usually you can see a leak with just a strong light. At night, go out with a flashlight and the engine off... trace the lines going in and out of the pump and look carefully. If that yields nothing, an old trick is to dust some talcum powder around and look for the tell-tale streaks from a small leak. Almost always, when there is a leak, it will be at a seal, a hose clamp or a fitting. Good luck.