What was found
CABIN DEPRESSURIZED AT 32,000FT AND CABIN RATE WENT TO ALL DASHES CABIN ALT SHOT UP TO 18,000FT AND ALL MASKED DEPLOYED. AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED PRESSURIZATION DIGITAL CONTROLLER IAW AMM 21-31-01. PRESSURE CONTROL SYSTEM FUNCTIONAL TESTED IN AUTOMATIC MODE GOOD, IAW AMM 21-31-00. AIRCRAFT WAS RETURNED TO SERVICE.