What was found
AFTER T/O ATTEMPTED TO RETRACT MLG, HEARD A LOUD NOISE & HAD CAUTION LIGHTS ILLUMINATE. GEAR UNSAFE, HYD PRESSURE , & LOW FLUID LIGHTS CAME ON. SELECTED GEAR DOWN & PULLED EMERGENCY BLOWDOWN HANDLE. GEAR WENT INTO DOWN & LOCKED POSITION & GEAR INDICATORS NORMAL, HYD LOW LEVEL LIGHT STAYED ON. CREW DECLARED AN EMERG & DIVERTED, LANDING UNEVENTFUL. A/C FOUND TO HAVE NO HYD FLUID, CAUSE BEING INVESTIGATED. COMPLETE CHK OF HYD SYS; ALL VALVES, ACTUATORS & PLUMBING COMPLETED, NO DEFECTS FOUND. FILTERS & PUMPS INSPECTED, NO DEFECTS NOTED. HYD RESERVOIR SUSPECTED FAILED, ALLOWING FLUID TO VENT OVERBOARD. RESERVOIR REPLACED & REMOVED COMPONENT IS BEING SENT TO OEM FOR EVALUATION. A/C RETURNED TO SERVICE.