What was found
CLIMBING OUT OF 12,000 RECEIVED A "CABIN ALT EXCEEDS 10,000" RED ECAM. DONNED O2 MASK. CABIN WAS VERIFIED ABOVE 10,000. BOTH FWD & AFT FLOW VALVE ON NR 2 SYSTEM WERE FULLY OPENED AND AMBER. BOTH FWD & AFT OUTFLOW VALVE ON NR 1 SYS WERE FULLY CLOSED. WENT TO MANUAL NO HELP. PERFORMED CABIN PRESSURE CONTROL AND MONITORING-ADJUSTMENT & TEST IAW AMM 21-31-00-05-01. ALL TEST GOOD. WHILE PERFORMING TEST NOTED SYS 2. REG PUSH BUTTON FAULT LIGHT, WOULD TAKE SEVERAL ATTEMPTS TO RESET. REMOVED AND REPLACED SYS 2 CABIN PRESSURE CONTROLLER (106HM) IAW AMM 21-31-11-04. OPS CHECKED GOOD.