As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3548 - STL - DURING CLIMBOUT, THE CREW RECEIVED A NR 2 ENGINE FIRE DETECTION WARNING FOR 2-3 SECONDS. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND A BAD ENGINE BLEED LINE. THE LINE WAS REMOVED AND REPLACED AND THE SYSTEM OPS CHECKED GOOD.