What was found
NOSE LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF, RETURNED TO MCI FOR UNSCHEDULED LANDING. DURING INSPECTION, ON JACKS, FOUND CADMIUM PLATING FLAKING OFF THE NLG PISTON. REMOVED AND REPLACED PISTON AND AXLE ASSEMBLY IAW 32-21-02. DURING TEARDOWN FOUND BEARING, P/N 5961561-1 AND RETAINER, P/N 3962423-1 SCRATCHED AND PARTS OF THE PLATING EMBEDDED ON SURFACE. BEARING AND RETAINER REPLACED IAW MM 32-21-02. OPERATIONAL CHECK IAW 32-30-00, NO DEFECTS NOTED.