What was found
ON CLIMBOUT FROM CLT AND UPON GEAR RETRACTION, CREW RECEIVED A LEFT MAIN LANDING GEAR RED LIGHT WITH HANDLE IN UP POSITION. UPON MOVING HANDLE TO OFF POSITION, BOTH THE RED AND GREEN LIGHT ILLUMINATED FOR THE LEFT MAIN LANDING GEAR. CREW FOLLOWED QRH, EXTENDED GEAR AND RECEIVED NORMAL GEAR DOWN INDICATIONS. FLIGHT RETURNED TO FIELD AT CLT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE CONFIRMED THE LEFT MAIN LANDING GEAR FAILED TO UPLOCK. REMOVED AND REPLACED UPLOCK ACTUATOR PER MM 32-32-41 AND UPLOCK DOWNLINE RESTRICTOR. EXTENSION AND RETRACTION CHECK GOOD PER MM 32-32-00. NO LEAKS NOTED.