As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2332: AFTER TAKEOFF, FUSELAGE DOOR WARNING ILLUMINATED INDICATING AFT BAGGAGE DOOR UNSECURE. UNABLE TO PRESSURIZE, RETURNED TO LAND AT SEA. AIRCRAFT WAS FERRIED TO PDX. MAINTENANCE REMOVED AND REPLACED AFT BAGGAGE DOOR ASSY IAW Q400 AMM TASK 52-31-01-000-802 AND 52-31-01-400-801. OPS TEST GOOD. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.