What was found
LAS - CREW REPORTED THAT DURING DESCENT INTO LAS AT APPROX 5,000' THE OUTFLOW VALVE INDICATED FULL OPEN, AMBER, AND THE A/C DEPRESSURIZED. AFTER LANDING CREW REPORTED THAT THE OUTFLOW VALVE INDICATES NORMAL, GREEN. MAINTENANCE REMOVED AND REPLACED THE OUTFLOW VALVE IAW AMERICA WEST AIRLINES T/C R2D21301. ALSO, REMOVED AND REPLACED THE NR 1 AND NR 2 CABIN PRESS CONTROLLERS IAW AIRBUS 320 AMM 21-31-34-401 AND AWA TASK CARD F1B21304.