As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE FLIGHT FROM CLT TO PNS THE -L COWL A/I- CAUTION MESSAGE ILLUMINATED. THE CREW FOLLOWED THE QRH. DUE TO ICING CONDITIONS AT PNS THE FLIGHT DIVERTED TO MGM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LT ENGINE COWL ANTI-ICE VALVE. OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.