What was found
ZONE TEMP LIGHT ON RECALL ILLUMINATED. GROUNDED - YES. PZTC BITE FAULTED FLT DECK TRIM VALVE ON BIT AND PREV FLT. GREEN GO LT ILLUMINATED AND CLEARED FAULT. RAN R & L A/C PACKS = AFT, FWD, AND CONT CAB TEMP CONTROL WAS SLUGGISH BUT OPERABLE WITH NO REOCCURRENCE OF CONT CAB TEMP LIGHT ILLUMINATING. CLEANED AFT, FWD, AND CONT CAB TEMP SENSORS AND FILTERS AS REQUIRED. RAN R & L PACKS AND ALL ZONE TEMPS RESPOND APPROPRIATELY. REF B737-900 FIM 21-62 TASKS 842, 801, & 883, B737-900 AMM 21-61-06.