As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT A LOUD BANGING NOISE WAS COMING FROM THE AROUND THE R2 DOOR. AN EMERGENCY WAS NOT DECLARED, ELECTED TO RETURN AS A PRECAUTION. LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE DOOR AND NO DEFECTS WERE NOTED. MAINTENANCE R & R THE R2 DOOR DEFLECTOR IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.