What was found
CONTROL CABIN TEMP CONTROL KNOB DOES NOT SEEM TO HAVE AN EFFECT ON CONTROL CABIN DUCT TEMP WHICH SEEMED STUCK AT 19 - 20 C, THE ENTIRE FLIGHT. ACFT GROUNDED. FOUND THE RECIRCIRCULATION FAN CIRCUIT BREAKER P6-4 E4 OPEN ON ARRIVAL. RESET THE CIRCUIT BREAKER IAW AMM 20-60-01-860-801, NO DEFECTS NOTED AND RECIRCULATION FAN OPERATES NORMALLY. PERFORMED PACK ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00-700-806-002, NO FAULTS NOTED ON EITHER CONTROLLER. OPERATED PACK TEMP, AND IT WAS CONTROLLABLE. THE RECIRCULATION FAN OPS TESTED IAW AMM 21-25-00-710-802-002.