What was found
SYR---CO2576, CREW REPORTED, LANDING GEAR LEVER DISAGREEMENT AFTER TAKEOFF. LEFT MAIN GEAR WOULD NOT RETRACT. AIRCRAFT AIR RETURNED TO SYR AND LANDED UNEVENTFULLY. MAINTENANCE REMOVED AND REPLACED LEFT MAIN LANDING GEAR UPLOCK BOX IAW 32-33-10. OPS CHECKED, RETRACTION TESTED, AND LEAK CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.