As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 0741 - ON CLIMB-OUT, THE RED GEAR UNSAFE LIGHT AND YELLOW GEAR DOOR OPEN LIGHT ILLUMINATED. CAPTAIN DECLARED AND EMERGENCY AND FLIGHT RETURNED TO CLT. MAINTENANCE REPLACED THE LEFT MAIN GEAR ACTUATING CYCLINDER. OPERATIONS CHECKED GOOD. (W)