What was found
DURING MASTER CAUTION RECALL, CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED, EXTINGUISHED ON MASTER CAUTION RECALL. ACFT GROUNDED. CONFIRMED DEFECT. BITE OF LEFT AND RIGHT PACK/ZONE TEMP CONTROLLERS IAW FIM 21-62 TASK 801. SHOWED FAULT FOR CONTROL CABIN TRIM AIR VALVE LOGGED ON BOTH RIGHT (PRIMARY) AND LEFT (BACKUP) CONTROLLERS AND VERIFY TEST CONFIRMED FAULT. CYCLED V143 TRIM AIR VALVE MANUALLY AND TESTED AGAIN, VERIFY TEST HAD SAME RESULT ON BOTH CONTROLLERS. REMOVED, REPLACED, AND TESTED V143 CONTROL CABIN TRIM AIR VALVE IAW AMM 21-61-21-000-801 & AMM 21-61-21-400-801, ALL TESTS PASS, NO LEAKS NOTED.