What was found
WHILE CRUISING AT FL 300 THE AUTO INOPERATIVE LIGHT ILLUMINATED ON THE CABIN PRESSURE CONTROLLER. NEITHER SYSTEM 1 OR 2 WERE OPERABLE. IAW QRH PROCEDURE CABIN HAD TO BE CONTROLLED MANUALLY. DECLARED EMERGENCY AND DURING LANDING RECEIVED WINDSHEAR WARNING. PERFORMED GO-AROUND. LANDED UNEVENTFULLY. MAINTENANCE REMOVED AND REPLACED NR 1 AND NR 2 CABIN PRESSURE CONTROLLERS, MODE SELECTOR PANEL AND OUTFLOW ACTUATOR. ADJUSTED NOZZLE ACTUATOR ROD IAW MM. OPERATION CHECKS OK.