As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO MAINTAIN CABIN PRESSURE IN DESCENT UNTIL FL220 . CREW REPORTED, IN DESCENT WITH BOTH THROTTLES AT IDLE CABIN ALTITUDE CLIMBED EXCESSIVELY. OPENED ISOLATION VALVE, THEN ABLE TO MAINTAIN CABIN PRESSURE BELOW FL220. FOUND NUMEROUS PACK SEALS IN RT AC BAY, REPLACED AS NEEDED. RAN PACK NO LEAKS NOTED. NOTE LT ENG HI STAGE BLEED WAS AND IS DEFERRED.