What was found
ON APPROACH, RECEIVED A "HYD VOLUME LOW" WARNING & OBSERVED BOTH VOLUME & PRESSURE GO INTO YELLOW WITH VOLUME EVENTUALLY GOING DOWN TO 50 CI. PERFORMED A MISSED APPROACH & ELECTED TO KEEP MLG DOWN & LOCKED. COMPLIED WITH CHECKLIST, DECLARED EMERGENCY, & DIVERTED. LANDED USING EMERGENCY BRAKING & ACCUMULATOR PRESSURE IN NWS. MX FOUND LT RETRACT FLEX LINE TO GEAR ACTUATOR LEAKING. DURING GEAR SWING, FOUND AN ADDITIONAL LEAK AT LT SHUTTLE VALVE. FLEX LINE REPLACED & SHUTTLE VALVE LINE TORQUED. ALL 4 WHEEL & TIRE ASSEMBLIES REPLACED & A SATISFACTORY MLG RETRACTION TEST PERFORMED. COMPLETED A SATISFACTORY OPS CHECK FLT & ACFT RETURNED TO SERVICE.