As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD BUZZING/WHISTLING SOUND FROM NOSE AND STALL FAIL MESSAGE. RETURNED TO BASE AND EMERGENCY EQUIPMENT RESPONDED. SUSPECT O2 SERVICE DOOR PARTIALLY OPEN CAUSING AIRFLOW INTERFERENCE OVER RIGHT AOA VANE. PROPERLY SECURED DOOR. PERFORMED STALL PROTECTION SYSTEM TEST PER MM 27-35-01. NO DEFECTS NOTED.