What was found
AFT CABIN ZONE TEMPERATURE VALVE INOPERABLE. PERFORMED ZONE TEMPERATURE CONTROLLER BITE IAW AMM 21-61-03. FOUND AFT ZONE TRIM VALVE FAULT. TRANSFERRED TO MDDR 133363 PER MEL 21-61-04-02, CAT C, DUE 03 SEP 20 18:47Z DC, PLACARDS INSTALLED. CB'S COLLARED. LP 1274161 ITEM 5: REMOVED AND REPLACED TRIM AIR MODULATING VALVE AFT V3, OPERATIONS CHECK NORMAL IAW AMM 21-61-07, THIS CLEARS MDDR # 133363.