What was found
THE PILOT REPORTED THAT THE AUTO 1 PRESSURE CONTROLLER WAS INOPERATIVE, LIGHT ILLUMINATED, PRESSURIZATION SYSTEM FAILED. THE AIRCRAFT WAS GROUNDED. MAINTENANCE PERFORMED A BITE TEST, AND FOUND THE NR 1 CONTROLLER HAD FAULTED. DETERMINED THAT IT WAS THE MOTOR. REMOVED AND REPLACED THE OUTFLOW VALVE ACTUATOR AND VALVE NOZZLE IAW AMM 21-35-05. OPS CHECKED GOOD.