As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AFTER TAKEOFF A LOUD WHINING NOISE COMING FROM THE NOSE OF THE AIRCRAFT. CREW ELECTED TO RETURN TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE EXTERNAL COMM DOOR OPEN. MAINTENANCE SECURED THE DOOR CLOSED. NO DEFECTS OR DAMAGE NOTED AT THIS TIME. AIRCRAFT WAS RELEASED FOR SERVICE.