What was found
AFTER ENGINE START AND RECALL CHECK. ALL 3 ZONE TEMPS LIGHTS ILLUMINATED. LIGHTS WOULD EXTINGUISHED ON RESET. TEMP CONTROLLERS DID NOT MOVE PACK TEMP. AFT CABIN SUPPLY DUCT AND AIR TEMP INDICATOR SHOWS HIGH TEMP WHEN SELECTOR FULL COLD AND FLUCTUATES. ACFT GROUNDED. R & R CABIN TEMPERATURE CONTROL MODULE, CLEARED TEMPERATURE CONTROL LIGHTS IAW AMM 21-61-15-400-801, OPS CHECK IAW AMM 21-61-00-700-806-022, 21-61-15-400-801. PERFORMED CABIN TEMP CONTROL AND INDICATION OPS TEST, OPS CK NORMAL REF 21-61-00-700-807-002. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST ON NR 1 AND NR 2 CONTROLLERS, NO FAULTS NOTED, SYSTEMS PASSED REF AMM 21-61-00-700-806-002. GROUND VERIFICATION CK GOOD.