What was found
LOG ITEM-CABIN PRESS EICAS MSG RED AND CABIN WARN SOUNDED AT FL 330. EMERG DESCENT ACCOMPLISHED. MANUAL CONT WORKS OK. STATUS MSG CABIN ALT AUTO 1 AND CABIN ALT AUTO 2 CAME ON IN FLT. CORRECTIVE ACTION-NR 1 CONTROLLER FAULTS CONTROLLER AND LOW INFLOW. NR 2 CONTROLLER FAULTS LOW INFLOW. REPLACED NR 1 AND NR 2 CABIN PRESS CONTROLLERS. RPL COCKPIT PRESS AND IND WARN MODULE. PRESSURIZED A/C TO 6 PSI, A/C HELD PRESS. PERFORMED BITE TEST OF PRESS CONTROLLERS AND OPN CHECKED NORMAL PER M/M CONTROLLER REPLACEMENT.