As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LOUD VIBRATION FELT AFTER TAKEOFF AND FELT IN FLOOR ON THE RIGHTSIDE OF FUSELAGE. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA FOUND EXTERNAL POWER DOOR OPEN ACCOMPLISHED TASK 05-51-04-210-801. NO DAMAGE FOUND OK FOR SERVICE.