What was found
CABIN PRESSURIZATION IN AUTO WOULD NOT PRESSURIZE, IN MANUAL MODE IT WAS UNCONTROLLABLE. MAINTENANCE PERFORMED: FOUND CABIN PRESSURE CONTROLLER TO BE FAULTING. R & R CABIN PRESSURE DIGITAL CONTROLLER, IAW AMM 21-31-01. OPERATIONS CHECK GOOD, IAW AMM 21-31-00-700. CLEAR MEL 21-10-3. OUTFLOW VALVE INHIBITORS RE-STOWED IN PROPER POSITIONS. AC OK FOR SERVICE.