As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L4 DOOR EXTREMELY LOUD NOISE COMING FROM LOWER HALF FRONT AND BACK OF DOOR SEALS. NEVER DISSIPATES THROUGHOUT FLIGHT. TROUBLESHOT IAW TSM 52-09-01. PERFORMED A FLASHLIGHT CHECK OF DOOR SEAL AND OPS CHECKED WITH NO DAMAGE FOUND. CLEANED THE SEAL AND VERIFIED SEAL IN GOOD CONDITION.