As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE L2 DOOR WAS MAKING A VERY LOUD NOISE DURING FLIGHT. AN EMERGENCY WAS NOT DECLARED AND LANDED WITHOUT INCIDENT. MX INSPECTED L2 DOOR SEAL, VENT FLAP SEAL AND CLEANED DEBRIS FROM L2 DOOR SEAL IAW AMM. ACFT IS GOOD FOR SERVICE.