What was found
ON TAKE-OFF, MLG FAILED TO FULLY RETRACT. WHEN GEAR HANDLE WAS PLACED IN THE "DOWN" POSITION, NLG DID NOT SHOW GREEN. CREW PERFORMED ALTERNATE EXTENSION PROCEDURE WITH HAND PUMP AND ALL 3 GEAR SHOWED "DOWN AND LOCKED". ACFT LANDED WITHOUT PROBLEMS. MX PUT ACFT ON JACKS & SWUNG MLG, PERFORMED FAULT ISOLATION PROCEDURE AMM 12-A-29-00-00A-420A-A. FOUND MLG SYSTEM'S HYD POWER-PACK MOTOR INOPERATIVE. VOLTAGE TO MOTOR VERIFIED AS PRESENT & CORRECT, AS WAS GROUND PATH. EXAMINED MOTOR & FOUND THE MOTOR WOULD OPERATE WHEN LIGHTLY TAPPED ON SIDE OF HOUSING. MOTOR ROUTED TO MFG FOR TESTING & OVERHAUL, A REQUEST WILL BE MADE FOR A FAILURE ANALYSIS.