What was found
AFTER TAKEOFF, HYDRAULIC LIGHT CAME ON, QUANTITY WAS 0, CHECKED ACCUMULATORS, MAIN LOW, EMERGENCY NORMAL. HYDRAULIC PUMP CONTINUED TO RUN UNTIL TURNED OFF. DUE TO WEATHER FLIGHT WAS DIVERTED TO CWA. MAINTENANCE SERVICED HYDRAULIC SYSTEM, PERFORMED GEAR SWINGS, OPS CHECK GOOD.