As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW DIVERTED FOLLOWING THE "FIRE WARNING" ILLUMINATING FOR THE NR 1 ENGINE. MAINTENANCE FOUND DAMAGE TO UPPER ENGINE COWL AND NOSE COWL FROM A BLOWN ANTI-ICE DUCT. NOSE COWL ANTI-ICE DUCT AND ANTI-ICE VALVE WERE BOTH REPLACED ALONG WITH THE UPPER ENGINE COWL AND NOSE COWL.