As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2451 - STL - FLIGHT CREW REPORTED AUTO PRESS INOP IN FLIGHT AND DECLARED EMERGENCY DESCENT INTO STL. IAH MX REMOVED AND REPLACED AUTO PRESS CONTROLLER AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.