As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AT CRUISE RECEIVED MASTER WARNING AND FUSELAGE LIGHT ILLUMINATED. CONDUCTED EMERGENCY CHECKLIST. AIRCRAFT DID NOT DEPRESSURIZE. MAINTENANCE REMOVED AND REPLACED AFT BAGGAGE DOOR HANDLE PROX SENSOR IAW Q400 AMM TASK 52-71-01-000-804 AND TASK 52-71-01-400-804. OPS TEST GOOD WITH NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.