As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2010 - CLIMBING THROUGH FL320 PRESSURIZATION ^P WAS 8 AND CABIN ALTITUDE WAS 8000. THE AIRCRAFT DESCENDED TO FL240 AT WHICH TIME THE ^P WAS 6.6 AND CABIN ALTITUDE WAS 4800. THROUGHOUT DESCENT THE CABIN ALTITUDE WAS REPORTED TO BE MUCH HIGHER THAN NORMAL AND THE ^P WAS MUCH LOWER THAN NORMAL IN ACCORDANCE WITH THE QRH MANUAL. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND REMOVED AND REPLACED THE CPAM, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.