As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN EXTERNAL GPU DOOR WAS LEFT OPEN ON INITIAL CLIMBOUT. CREW WAS INSTRUCTED TO RETURN TO CLT AND HAVE THE AIRCRAFT INSPECTED FOR DAMAGE. CREW LANDED IN CLT WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND NO DAMAGE. MAINTENANCE CLOSED THE DOOR. AIRCRAFT WAS RELEASED FOR SERVICE.