As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROTE, FLIGHT ATTENDANT REPORTED HIGH PITCHED SQUEAL FROM MAIN BOARDING DOOR. CABIN ALT 2900' SOUND WENT AWAY AT D=7.2 CABIN ALT 2300. INSPECTED PAX DOOR & SEAL IAW AMM 52-11-10, FOUND NO DAMAGE ON SEAL, BUT SEAL HAD GLYCOL & DIRT. CLEANED & LUBED SEAL.