As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LT COWL ANTI-ICE MESSAGE IN FLIGHT WITH COWL ICE SELECTED OFF. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED, & R & R LT DUCT VALVE, R & R LT COWL ANTI-ICE RELIEF VALVE AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.