As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3510 -ATB- DUE TO FORWARD OUTFLOW VALVE OPEN AND CABIN WILL NOT PRESSURIZE. CORRECTIVE ACTION: FOUND FORWRD OUTFLOW VALVE FAULTED. PLACED VALVE ON MEL. R/R CPCS OCU #1 IAW A350 AMM 21-31. OPS CHECK GOOD. PER MCC OUTFLW VALVE #1 STILL REQUIRES REPLACEMENT. CONT ON MEL 21-31- 09A. (9050072)