As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE/ALTITUDE UNCONTROLLABLE IN FLIGHT IN AUTO OR MANUAL / REMOVED AND REPLACED OUTFLOW VALVE IAW CRJ900 AMM 21-32-01-000/400-801, FUNCTIONAL TEST GOOD. PERFORMED OPS TEST OF CPCP IAW CRJ900 AMM 21-33-01-710-801, OPS TEST GOOD. OCF FLIGHT FOUND TO BE SATISFACTORY, NO DEFECT NOTED.