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 AMBER MESSAGE WITH LEFT COWL ANTI-ICE SWITCH SELECTED OFF. CREW DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT ENGINE COWL ANTI-ICE SYSTEM, REMOVED AND REPLACED LEFT COWL ANTI-ICE VALVE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.