As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEFECT 700594: DURING DESCENT CABIN ALTITUDE UNCONTROLLABLE. RAN QRH 2.4 SWITCHED TO ALT, NO CHANGE. SWITCHED TO MAN AND OPENED OUTFLOW MANUALLY. RESOLUTION: FOUND FAULT 42 ON CPC #2 REMOVED AND REPLACED #2 CABIN PRESSURE CONTROLLER OPS CHECK GOOD REF AMM 21-31-00.