As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2547, DURING CLIMB THE CREW REPORTED THAT THE AUTO PRESSURIZATION WAS NOT WORKING AND THAT THE EICAS INDICATIONS WERE INTERMITTENT. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE CPAM MODULE, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.