As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER TAKEOFF, THE PILOT REPORTED EXCESSIVE AIRFLOW NOISE LEVELS IN FLIGHT AND VISIBLE LIGHT AT CARGO DOOR. AIRCRAFT RETURNED TO DEPARTURE. NO EMERGENCY WAS DECLARED. LANDED WITHOUT INCIDENT. AFTER LANDING, THE DOOR WAS SECURED. AIRCRAFT WAS RETURNED TO SERVICE.