What was found
AFTER STARTING BOTH ENGINES, PERFORMED A SYSTEM RECALL. ON RECALL THE AIR CONDITION ILLUMINATED IN THE 6-PACK. ON THE OVERHEAD PANEL THERE WAS A CONTROLLER CABIN ZONE TEMP AND LT AND RT PACK LIGHTS. PERFORMED QRH FOR THE PACK LIGHTS AND NEITHER LIGHT CLEARED. ACFT GROUNDED. BITE TEST OF NR 1 PACK ZONE TEMP CONTROLLER LOGGED. MIX MANIFOLD SENSOR AND NR 2 PACK ZONE TEMP CONTROLLER LOGGED. MIX MANIFOLD SENSOR AND DUCT SENSOR. CLEARED LOGGED FAULTS ON BOTH CONTROLLERS. BITE TEST NORMAL, REF AMM TASK 21-62-00-810-801. OPERATED BOTH PACKS, NO DEFECTS NOTED.