As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2575 - EWR - FLIGHT CREW REPORT BANGING NOISE IN FLIGHT - SUSPECT GPU DOOR OPEN - CREW DECIDED TO PERFORM AIR RETURN AND LANDED ACFT UNEVENTFULLY. EWR MX CLOSED GPU DOOR PROPERLY. NO DAMAGES FOUND IN THE AREA. ACFT WAS APPROVED TO RETURN TO SERVICE.