As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD SQUEAL FROM CREW ENTRY DOOR. DID NOT BEGIN UNTIL AFTER WE LEVELED AT FLT LEVEL 360 CABIN ALTITUDE WAS 5600' DIF WAS 8.5 PSI SEEMS LIKE ITS COMING FROM BOTTOM OF DOOR. FOUND LOWER RIGHT SEAL OFF RETAINER CLEANED & RESECURED SEAL IAW AMM 52-09-02-401. NO LEAKS NOTED AT THIS TIME.