As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - AIRCRAFT DIVERTED TO PDX AFTER CREW REPORTED MODERATE VIBRATION THAT OCCURED ALL OF A SUDDEN IN CRUISE. FOUND NR 2 STUB WING BLOW OUT DOOR OPEN. OPERATIONAL CHECK DOOR TENSION AND BLED AIR SYSTEM FOR LEAKS. NO DEFECTS FOUND. NO PARTS REPLACED, OPERATIONAL CHECK GOOD.