What was found
RT PACK LIGHT ILLUMINATES ON MC RECALL, GOES OUT ON MC RESET. ACFT GROUNDED. ACCOMPLISHED FIM 21-62, TASK 801 R/T PACK-ZONE TEMP CONTROLLER BITE. FURTHER TROUBLESHOOTING FOUND NUMEROUS "ZONE TRIM VALVE" FAULTS & FAILS. ACCOMPLISHED FIM 21-62, TASK 834 FORWARD CABIN TRIM AIR VALVE FAULT ISOLATION, PATCHED IN ANOTHER KNOWN GOOD NR 2 CABIN TEMP CONTROLLER, M1443, NO HELP. REINSTALLED ORIGINAL NR 2 CABIN TEMP CONTROLLER (M1443) IAW AMM 21-61-20. SUSPECT INTERMITTENT "FORWARD CABIN TRIM AIR VALVE" FAULT V144. REPLACED ZONE TRIM AIR VALVE, V144, FWD CABIN AS REQUIRED. PRESSURE CHECKED WITH NO LEAKS NOTED. PERFORMED BITE TEST ON PACK/ZONE TEMP CONTROLLER NO FAULTS FOUND.