What was found
PDIS 664 21-30 5359 24FEB23 ABQ OPEN U 2 HOURS INTO WHILE USING PRESS REG #1, PRESS REG ONE FAULTED. WE TURNED SYST #1 OFF PER ECAM. THE SYSTEM SWITCHED TO REG #2. PRESS REG #2 FAULTED SHORTLY AFTER. WE DESELECTED #2 PER ECAM. ECAM PRESS PAGE SHOWED FORWARD OUTFLOW VALVE FULLY OPEN. CAB ALTITUDE RAPIDLY CLIMBED TO MAX ON OVERHEAD CAB ALT GAUGE. WE WERE UNABLE TO CONTROL CAB ALT WITH MANUAL PRESSURIZATION. CAB ALT COMPLIED WITH ECAM AND QRH. DIVERTED TO ABQ PER GOC. EMERGENCY WAS NOT DECLARED.