As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB MSP-GEG, FOUND THAT THE AIRCRAFT WOULD NOT PRESSURIZE. FURTHER INVESTIGATION REVEALED AN AIR LEAK AT THE MAIN CABIN DOOR. DOOR WARNING INDICATED THAT THE DOOR WAS CLOSED. RETURNED TO MSP WITHOUT FURTHER INCIDENT. FOUND THAT THE DOOR WAS OUT OF RIG. ADJUSTED GUIDE ARM. PRESSURE CHECKED OK. CORRECTED COPY: MCD WAS CHANGED TO MAIN CABIN DOOR.