As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, CREW COULD NOT PRESURIZE AIRCRAFT. AIRCRAFT RETURNED TO PIT. MAINTENANCE INSPECTED AND REPLACED THE PRIMARY OUTFLOW VALVE IN ACCORDANCE WITH BOMBARDIER MAINTENANCE MANUAL 21-00-00. OPERATIONAL CHECKS WERE PERFORMED AND AIRCRAFT WAS RELEASED FOR SERVICE.