As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LOUD NOISE COMING FROM THE F/O'S SIDE AFTER TAKEOFF. CREW RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE RIGHT HAND FORWARD FUSELAGE AREA. SUSPECT COMM DOOR LEFT OPEN BUT WAS NOT OPEN UPON ARRIVAL TO AIRCRAFT. NO DEFECTS NOTED. AIRCRAFT WAS RELEASED FOR SERVICE. NOTE: WHEN MAINTENANCE ARRIVED AT THE AIRCRAFT, DOOR WAS CLOSED.