What was found
AFTER START, PRESSING THE MASTER CAUTION 6 PACK, THE AIR CONDITIONING LIGHT ILLUMINATED ALONG WITH THE LT PACK LIGHT AND MASTER CAUTION LIGHT. PRESSING THE MASTER CAUTION LIGHT AGAIN THE LT PACK AND AIR COND LIGHTS EXTINGUISHED. ACFT GROUNDED. PERFORMED PACK ZONE TEMP CONTROL BITE IAW FIM 21-62 TASK 801 ZONE TEMP CONTROLLER NR 1 FAULTED TCV. REPLACED TEMP CONTROL VALVE IAW AMM 21-51-10-400-801. OPERATED LT A/C PACK THEN NO FAULTS NOTED. PERFORMED PACK/ZONE TEMP CONTROL BITE TEST IAW MM 21-61-00-700-806-002 BITE TEST IS GOOD NO FAULTS FOUND.