What was found
ON MASTER CAUTION RECALL, MASTER CAUTION, AIR CONDITIONING, AND LEFT PACK LIGHTS ILLUMINATED. LEFT PACK LIGHT EXTINGUISHED ON MASTER CAUTION RESET. ACFT GROUNDED. HAS A HISTORY. NR 1 PACK, TEMP CONTROLLER SHOWS TCV FAULT. RESET FAULT. REMOVED AND REPLACED THE LT PACK TEMP CONTROL VALVE, LEAK CHECKED AND OPS CHECKED GOOD IAW AMM 21-51-10-000-801, AND 400-801, BITE TEST PASSED IAW AMM 21-61-00-700-806-002.