What was found
MASTER CAUTION TEST, CONTROLLER CAB LIGHT, AIR COND AND MASTER CAUTION LIGHT REMAIN ILLUMINATED. WHEN RESET ALL LIGHTS TURN OFF. ACFT GROUNDED. PERFORMED BITE TEST ON PACK/ZONE TEMP CONTROLLERS NR 1 AND NR 2 REF FIM 21-62, TASK 801. FOUND FAULTS ON BOTH CONTROLLERS, FLT DECK SELECTOR. CLEARED FAULTS AND RAN PACKS. CONTROLLER CABIN TEMP CONTROL OPS NORMAL. NO FAULTS. REPLACED CABIN TEMP CONTROLLER MODULE IAW MM 21-61-15-400-801. OPS NORMAL. COMPLETED MM 21-61-00-700-807-002, OPS NORMAL.