As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LOUD WHINE OR SCREECH FROM THE RIGHT SIDE OF THE COCKPIT AFTER TAKEOFF. CREW ELECTED TO RETURN TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE GPU POWER DOOR OPEN. MAINTENANCE CLOSED THE DOOR AND FOUND NO DEFECTS. AIRCRAFT WAS RELEASED FOR SERVICE.