What was found
DURING CLIMB-OUT, THE CABIN AUTOMATIC PRESSURIZATION SYSTEM BECAME INOPERATIVE AND THE CABIN MANUAL PRESSURIZATION CONTROL SYSTEM OPERATED POORLY. THE FLIGHT RETURNED TO SAT AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE CABIN PRESSURE CONTROLLER, CABIN CONTROL RESET REGULATOR, AND CLEANED THE CABIN CONTROL EJECTOR. OPERATIONAL CHECK OK.