What was found
PAC OHEAT & CBN OHEAT FOLLOWED BY LOSS OF PRESSURIZATION. AFTER A NORMAL TAKE OFF, WHILE MAKING FINAL CLIMB FROM FL410 TO FL430 FLIGHT CREW RECEIVED AN AMBER CAS MESSAGE COCKPIT PAC O'TEMP" CREW FELT A PRESSURE CHANGE , CREW OXYGEN MASKS WERE DONNED AND PASSENGER MASKS DEPLOYED & DONNED. AIRCRAFT PERFORMED EMERGENCY DECENT AND DIVERTED. AIRCRAFT LANDED WITHOUT INCIDENT. TROUBLESHOOTING FOUND BOTH PRE-COOLER TEMP SENSOR OUT OF RESISTANCE RANGE , PRE COOLER DOOR ACTUATOR STICKING.