As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2172, DURING CLIMB THE CREW REPORTED A RAM AIR VALVE FAILURE MESSAGE WITH THE INABILITY TO HOLD CABIN ALTITUDE BELOW 10K' ABOVE 21K' AIRCRAFT ALTITUDE. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE RIGHT HAND RAM AIR DOOR LINEAR ACTUATOR, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.