As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT NR 1 PRESSURE REGULATOR FAULT DURING CLIMB, FWD NR 1 OUTFLOW VALVE STUCK FULL OPEN. QRH NO HELP. CABIN WOULD NOT PRESSURIZE. TROUBLESHOT TO NR 1 FWD OUTFLOW VALVE STUCK OPEN. REPLACED OUTFLOW VALVE IAW AMM CH 21-31-12-04-01. OPS CKS GOOD. ACFT OK FOR SERVICE.