As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEARD A LOUD NOISE COMING FROM R1 DOOR. SOUNDED LIKE CONTINUOUS TONE AND WOULD LAST FOR 5 MINUTES, IT HAPPENED TWICE. ACCOMPLISHED VISUAL INSPECTION OF DOOR PANELS FOR SECURITY , NO DEFECTS NOTED. ACCOMPLISHED VISUAL INSPECTION OF DOOR SEAL AND SEAL AREA IAW AMM 25-11-00. REMOVED FOOD DEBRIS AND MOISTURE NO FURTHER DEFECTS NOTED AT THIS TIME