As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BZN - FLT 1315 - DURING CRUISE FLIGHT, THE DOOR UNSAFE LIGHT AND CARGO DOOR WARNING LIGHT CAME ON WHILE CREW WAS ADJUSTING PRESSURIZATION. CREW DEPRESSURIZED AIRCRAFT, LANDED AT NEAREST AIRPORT. CARGO DOOR PRESSURE SWITCH WAS SET ON THE EDGE OF TRIP SETTING AND OPENED AT HIGH CABIN PRESSURE DIFFERENTIAL. (X)