As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R2 DOOR STILL SQUEALING IN FLIGHT. NO EFFECT ON PRESSURIZATION, F/A'S REPORT THAT NORMAL CONVERSATION IS DIFFICULT IN AFT GALLEY. GROUNDED - YES. PRESSURIZED AIRCRAFT AND CONFIRMED LOUD SQUEAL @ 4 PSI DIFFERENTIAL PRESSURE. REMOVED AND REPLACED AFT OUTFLOW VALVE ASSEMBLY REF AMM 21-31-03-000-801 AND AMM 23-31-03-400-801. INSTALLATION TEST GOOD. PRESSURIZED AIRCRAFT TO 4 PSI DIFFERENTIAL PRESSURE. NO SQUEAL OR ABNORMAL NOISES NOTED AT R2 DOOR.