As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AND UPON REACHING CRUISE ALTITUDE, THE CABIN CONTINUED TO CLIMB. CREW REQUESTED TO DEPART FL240 AND DESCENDED TO 9000 FT FOR THE DURATION OF THE FLIGHT. CABIN ALTITUDE WAS 10,000 FT AT FL240 AND WAS 6000 FT WHEN AIRCRAFT WAS AT 9000 FT. LANDING AT OMA WAS UNEVENTFUL. MAINTENANCE REPLACED A BLOWN DUCT ON THE LEFT ACM. AIRCRAFT RETURNED TO SERVICE.