What was found
LEFT PACK LIGHT COMES ON WITH RECALL. EXTINGUISHES WITH RESET. ACFT GROUNDED. ACCOMPLISHED TASK 21-61-00-700-806-002 PACK/ ZONE TEMP CONTROLLER. BITE TEST ON NR 1 CONTROLLER LOGGED MULTIPLE FAULTS ON MULTIPLE SYS. SWAPPED NR 1 AND NR 2 CONTROLLERS. FAULTS FOLLOWED CONTROLLER. REPLACED NR 1 CONTROLLER AND REINSTALLED NR 2 CONTROLLER REF MM TASK 21-61-20. NR 1 CONTROLLER NOW LOGS THIS PACK TCV FAULT. ACCOMPLISHED FIM TASK 212-62, TASK 830, LT TEMP CONTROL VALVE - FAULT ISOLATION. REPLACED NR 1 TCV (V139) REF MM TASK 21-51-10, GROUND VERIFICATION CHECKS NORMAL.