As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYC - FLIGHT 2333 - DURING LIFTOFF, CREW RECEIVED A MASTER WARNING FOR FUSELAGE DOORS, AND THE AIRCRAFT DID NOT PRESSURIZE. MAINTENANCE INSPECTED AND FOUND THE FORWARD BAGGAGE DOOR SENSOR FROZEN. THE DOOR SENSOR WAS CLEANED AND LUBED. OPERATIONAL CHECKS OF THE DOOR AND THE PRESSURIZATION SYSTEM WERE PERFORMED AND CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE.