As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE F/A REPORTS A HUMMING NOISE COMING FROM THE MAIN CABIN DOOR DURING CLIMB. SOUND WENT AWAY WHEN LEVEL AT FL200. TRANSFERRED TO NRWC 643-ORD-02682. REPAIRED MAIN CABIN DOOR RUBBER TRIM SEAL, TOP SECTION IAW AMM 52-10-04. PRESSURIZATION CHECK GOOD IAW AMM 21-31-00.