As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LEFT COWL ANTI-ICE CAS MESSAGE AFTER TAKEOFF WITH ANTI-ICE SELECTED OFF. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT USING FIM (FAULT ISOLATION MANUAL), REMOVED AND REPLACED LEFT ENGINE COWL ANTI-ICE PRESSURE SWITCH AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.