What was found
CAC MANF DECAY CK AT FL380. FOLLOWING THE CHECK, LEVEL 1 AVNCS FAN OVRD, AIR SYS 3 OFF, AND AIR SYS 2 OFF. REMOVED AND REPLACED ENVIRONMENTAL SYSTEM CONTROLLER, ADJUSTMENT/TEST PASSED PER ABOVE REFERENCES. REMOVED AND REPLACED ENVIRONMENTAL SYSTEM CONTROLLER, ADJUSTMENT/TEST PASSED. PSC-1 AND PSC-2 R-T-S PASSED. AIR SYSTEM TEST PASSED. ACFT OK FOR SERVICE