What was found
RDM - ACFT FAILED TO PRESSURIZE. FA REPORTS LOUD SOUND AT DOOR L2. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. INSPECTED MCD SEAL, AFT ENTRY DOOR SEAL, AFT CARGO DOOR SEAL, NO DEFECT NOTED. PRESSURIZED AIRCRAFT IAW AMM TASK 21-00-00-863-80, TASK 21-00-00-863-802, NO DEFECT NOTED, ACFT OK FOR CONTINUED SERVICE. NO PARTS REPLACED.