As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- FLIGHT 2459 (SEA-STS) - EN ROUTE RECEIVED A CABIN PRESSURE CAUTION LIGHT. FLIGHT ATTENDANT REPORTED A LOUD NOISE FROM THE REAR PASSENGER DOOR. NO EMERGENCY DECLARED. DIVERTED INTO PDX. ACCOMPLISHED UNEVENTFUL LANDING. MAINTENANCE FOUND THE AFT BAGGAGE DOOR SEAL TO BE LOOSE. REPLACED THE SEAL. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.