As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:NAPASSING 10000' A LOUD SQUEAL EMITTED FROM MAIN DOOR. STOPPED SQUEALING APPROX 18000'. NO CHANGES TO PRESSURIZATION, CABIN ALTITUDE, OR (ILLEG). NO PHYSIOLOGICAL EFFECTS FELT. SOUND EMITTING FROM BOTTOM SEALFOUND CREW ENTRY DOOR SEAL LOOSE APPROX 2" @ 6 O'CLOCK POSITION. REINSTALLED SEAL INTO SEAL RETAINER IAW AMM 52-09-01-424-019.