What was found
AIRCRAFT WAS GROUNDED: UPON GEAR RETRACTION HAD RED LEFT GEAR INDICATION. GEAR APPEARED TO BE STOWED BASED ON NO VIBRATION AT CRUISE ALT 370-PHONE PATCH TO MAINTENANCE-ADVISED TO CHECK MANUAL GEAR EXTENSION ACCESS DOOR. UPON TOUCHING THE DOOR LEFT MAIN GEAR BECAME FULLY EXTENDED. OBSERVED ALL GEAR SPEED RESTRICTIONS AND EMERGENCY WAS DECLARED AND DIVERTED TO CLT. AIRCRAFT WAS NOT OVERWEIGHT FOR LANDING. LANDING UNEVENTFUL-GEAR INDICATION SAFE. REMOVED AND REPLACED LEFT MAIN LANDING GEAR ACTUATOR PER JOB CARD 08L70032007 OPERATIONS AND LEAK CHECK OK.