What was found
EWR - FLT 1056 - AFTER GEAR RETRACTION, THE LEFT MAIN GEAR UNSAFE LIGHT REMAINED ILLUMINATED. WITH HANDLE IN 'OFF' POSITION, THE LEFT MAIN GEAR EXTENDED DOWN AND LOCKED. CREW RECYCLED GEAR AND SAME PROBLEM OCURRED. FLIGHT RETURNED TO FIELD AT EWR AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE LEFT MAIN LANDING GEAR MODULAR ASSEMBLY PER MM 32-32-61. OPS CHECK AND LEAK CHECK GOOD ON GROUND. (M)