As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNUSUAL VIBRATION FELT ON CLIMBOUT AT FL200 AND ABOVE..290-300KT S COMING FROM COCKPITFLOOR ON WALK AROUND FOUND EXT POWER DOOR NOT SECURED, CLOSED DOOR AND CHECKED SECURITY. NO ISSUES NOTED. PER FIM TASK 05-51-04-210-801 UNUSUAL VIBRATION INSPECTION. C/W