As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LOUD NOISE ABOVE 210KTS DURING CLIMBOUT. THE FLIGHT RETURNED TO CLT WHERE MAINTENANCE DISCOVERED THE EXTERNAL SERVICE PANEL DOOR OPEN. THE DOOR WAS INSPECTED AND OPERATIONALLY CHECKED. NO DAMAGE WAS FOUND AND THE LATCHES FUNCTIONED PROPERLY. THE DOOR WAS SECURED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.