As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED DURING FLIGHT, DIVERTED DUE TO AN AMBER RT NAC HT FAIL ON THE CAS MASSAGE WITH AN ASSOCIATED AMBER NAC FI DURING FLIGHT. THE LANDING WAS UNEVENTFUL. TROUBLESHOT AND DETERMINED THAT A FAULT WITH THE NACELLE HEAT PRESSURE SWITCH. THE PRESSURE SWITCH WAS REPLACED AND FUNCTIONAL CHECKS WERE SATISFACTORY.