What was found
ON APPROACH INTO PHX ,THE LEFT HYDRAULIC SYSTEM WENT TO ZERO. CREW LANDED AIRCRAFT WITHOUT INCIDENT. FOUND HOLE IN LMG DOWNLOCK ACTUATOR FLEX LINE. HOLE WASN'T CAUSED BY CONTACT W/ANYTHING. THE HOLE APPEARS TO BE FROM FATIGUE NEAR A SWAGED FTG. FLEX LINE REPLACED. REPLACED CASE DRAIN AND PRESSURE FILTERS NO METAL FOUND REF MM 29-11-17-4. REPLACED ACMP CASE DRAIN AND PRESSURE FILTERS PER AMM 29-11-18-4. ALL LEAK CHECKS GOOD.