What was found
FRM 21 90 10 00 CABIN AUTO INOPERABLE (EICAS) CABIN ALT 1 STATUS. CABIN ALT AUTO 2 STATUS. AFTER QRF THE FOLLOWING CORRECTIVE ACTION WAS PERFORMED: HAS BEEN PERFORMED FIM 21-31 FT 803 FOR BOTH SYSTEMS. FOR 2 SUDE BLOCK 1, 2, 3, 4, 5 AND 6 SYSTEMS OPERATE PROPERLY. FOR 1 SIDE WAS REPLACED CABIN PRESSURE CONTROLLER. ON TEST BOTH SYSTEM OPERATE NORMALLY.