What was found
AIR TURN BACK DUE TO AIRCRAFT NOT PRESSURIZING IN THE CLIMB. CAS MESSAGES FOR "BLEED 1 AND 2 OFF", "PAC OFF", AND "DOOR PAX SEAL FAIL". AIRCRAFT PRESSURIZED ON APPORACH AND AIRCRAFT LANDED WITHOUT INCIENT. PERFORMED FIM TASK 21-00-00-810-801-A WITH NO FAULTS FOUND AND IS CONSIDERED A TRANSITORY CONDITION OF THE AIR CONDITIONING CONTROLLER. REMOVED AND REPLACED AIR CONDITIONING / PNEUMATIC PANEL. PERFORMED COOLING PACK SYSTEM OPS TEST AND PNEUMATIC SYSTEM OPS TEST WITH NO DEFECTS NOTED.