As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFR - FLIGHT 2526 (SMF-PDX), EN ROUTE AT CRUISE FLIGHT (38,000 FT) RECEIVED A CABIN PRESSURE WARNING. DEPLOYED THE PASSENGER OXYGEN MASKS AND DESCENT TO 11,000 FEET. DIVERTED TO MFR AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE FOUND A CABIN PRESSURE CONTROLLER FAILURE (CODE 009). REPLACED THE CONTROLLER. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.