What was found
CLT - FLT 7304 - LEFT GEAR DOOR OPEN INDICATION CONTINUED AFTER LANDING GEAR RETRACTION. VISUALLY VERIFIED THAT DOOR WAS CLOSED RETURNED TO CLT FOR MAINTENANCE. MAINTENANCE PERSONNEL INSPECTED GEAR DOOR SYSTEM AND THEN REMOVED AND REPLACED LEFT GEAR DOOR SPRING. PERFORMED LANDING GEAR RETRACTION TEST ALL INDICATIONS NORMAL. AIRCRAFT WAS THEN RETURNED TO SERVICE. (M)