As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTED A HIGH FREQUENCY SOUND AND VIBRATION AFTER TAKEOFF AND NOTED AS AIRSPEED SLOWED DOWN SOUND WENT AWAY. PERFORMED INSPECTION ON AIRCRAFT FOUND 6PV DOOR OPEN NO EXTERNAL DAMAGE TO THE SKIN WAS FOUND AT THIS TIME RE-SECURED THE DOOR AS REQUIRED AIRCRAFT RETURNED TO SERVICE.