As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE CAUTION MESSAGE DURING CRUISE. THE CREW DECLARED AN EMERGENCY, DIVERTED TO NEAREST FIELD AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS FERRIED TO THE NEAREST SUITABLE MAINTENANCE FACILITY. MAINTENANCE TROUBLESHOT, REMOVED AND REPLACED THE OUTFLOW VALVE AND PERFORMED CHECKS IAW THE AMM. THE AIRCRAFT WAS RELEASED FOR SERVICE.