As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLT 310, CABIN PRESSURE BECAME UNCONTROLLABLE. OUTFLOW VALVES WERE INDICATING FULLY CLOSED. CABIN ALTITUDE WAS CLIMBING 200 FPM.(<P>COMPLETED THE FOLLOWING CHECKS PER BOEING SR: CABIN SYSTEM CONTROL PRESSURE TEST AMM TASK 21-31-00-735-011 AND EXCESSIVE CABIN PRESSURE LEAKAGE TEST PER AMM 05-51-08-702-001. PARTS REPLACED. REF AMM 21-26-15/401. R & R FWD CARGO OVERBOARD VALVE.