As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OCA - FLT 0611 - THE NR 2 ENGINE HAD A FIRE WARNING SHORTLY AFTER TAKEOFF FROM DCA. ACFT WAS RETURNED TO DCA WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NR 2 ENGINE NOSE COWL ANTI-ICE DUCT BLOWN. THE ANTI-ICE DUCT WAS REPLACED. LEAK AND OPERATIONAL CHECKS WERE GOOD. (X)