What was found
DURING DEPARTURE, NR 2 PRESSURE REGULATOR FAILED SHORTLY FOLLOWED BY NR 1 REGULATOR FAILING. CABIN CLIMBED UNCONTROLLABLY, STOPPED CLIMB AT 10K OR BELOW. ECAM DISPLAYED AFT OUT FLOW VALVE FULLY OPEN. SELECTED OUTFLOW VALVE OFF, CABIN PRESSURIZED NORMALLY WITH NO SYS FAULTS. COMPLIED WITH ECAM & QRH PROCEDURES. IAW AMM 21-31-12-04 REPLACED AFT OUT FLOW VALVE. PERFORMED ALL REQUIRED TEST IN BOTH NR 1 & 2 SYSTEMS, NO FAULTS NOTED.