As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT BAGGAGE SEAL LIGHT CAME ON THEN CABIN ALTITUDE STARTED TO CLIMB. CLOSED BAGGAGE ISOLATION VALVE, CABIN ALTITUDE CONTINUED TO CLIMB. COULD NOT CONTROL CABIN ALTITUDE IN AUTO OR MANUAL MODE. DECLARED EMERGENCY AND DIVERTED AIRCRAFT TO MTJ. AIRCRAFT LANDED SAFELY. PURGED BAGGAGE DOOR SEAL IAW CESSNA 750 MM CHAPTER 52-30-04. REPLACED ISOLATION VALVE SOLENOID IAW CESSNA 750 MM CHAPTER. OPS CHECK SYSTEM IAW CESSNA 750 M/M CHAPTER 21-51-00, SYSTEM OPS CHECKED GOOD.