What was found
CABIN TEMP NOT CONTROLLABLE UNLESS ALL ZONE TEMP SWITCHES ARE PLACED IN OFF. GROUNDED - YES. PER FIM 21-62 TASK 905, REMOVED AND REPLACED DUCT TEMPERATURE LIMIT SENSORS AT FWD AND AFT POSITIONS AND BOTH, PRIMARY AND BACK UP CONTROL CABIN LIMIT SENSORS. REF AMM 21-61-04/401. REMOVED AND REPLACED FLIGHT DECK TEMPERATURE SENSOR. REF AMM 21-61-10/201. OPS TEST PASS. PERFORMED PZTC BITE TEST. NO FAULTS AT THIS TIME. REF AMM 21-61-00/501.