As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE BECAME INOPERATIVE DURING CRUISE AT FL330. FOLLOWED COCKPIT OPERATING MANUAL PROCEDURE AND CONTROLLED CABIN MANUALLY. FLIGHT DIVERTED TO STL AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE CABIN PRESSURE CONTROLLER, OPERATIONAL CHECK OK.