What was found
ABOUT 2 MINUTES AFTER LEVEL OFF AT FL330, CABIN ALTITUDE MASTER WARNING MESSAGE APPEARED. ABOUT 1 MINUTE LATER, CABIN AUTO INOP MASTER CAUTION MESSAGE APPEARED. CABIN ALTITUDE CLIMBED TO ABOUT 14,000 . STATUS MESSAGES CABIN ALT AUTO 1 AND CABIN ALT AUTO 2 APPEARED. COMPLIED WITH QRC AND QRH. FACT 25JUL23 10:37 MEM FIM: FAULT TREE 802 FIG 103 FIM: FAULT TREE 810 FIG 108 AMM: 21-31-02-4 AMM: 21-31-04-4 AT GATE EICAS DISPLAYED CABIN ALT AUTO 2 STATUS MESSAGE. PERFORMED BITE OF CONTROLLERS UING FIM 802 FIG103. ALL TEST PASSED. REMOVED AND REPLACED #2 AUTO CONTROLLER PRECAUTIONARY PER ABOVE REFERENCE.