As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, HEARD LOUD NOISE, LOSS OF AIR CONDITIONING AND A FLOW LIGHT ILLUMINATED. RECEIVED FIRE WARNING ON THE NR 2 ENGINE. FOLLOWED ENGINE FIRE PROCEDURES. THE FIRE WARNING WENT OUT AT IDLE THRUST. TESTED THE FIRE WARNING SYSTEM AND TESTED GOOD. RETURNED TO ATL. REPLACED DAMAGED ENGINE COWL AND APRON.