What was found
FLIGHT 798, PHL-AMS: DURING FLIGHT, CREW REPORTED LOSS OF THE CENTER HYDRAULIC SYSTEM QUANTITY. FLIGHT DIVERTED TO YQX. MAINTENANCE ACTION PENDING. UPDATED 12/28/07: MAINTENANCE FOUND WETTING IN RT MAIN WHEEL WELL. CLEANED WHEEL WELL AND OPERATED FLAPS/SLATS, SPOILERS, RUDDER, AILERONS, HYD GENERATOR. PINNED GEAR AND CYCLED. NO LEAKS FOUND. RESET STEERING AND BRAKE ISOLATION VALVE. NO LEAKS FOUND.