As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF WHILE CLIMBING THROUGH 3000 FEET THE FIRE WARNING LIGHT ON THE CENTER FWD PANEL ILLUMINATED, ACCOMPANIED BY THE FIRE WARNING BELL. THE WARNING LASTED FOR APPROXIMATELY 2-3 SECONDS WITH NO OTHER INDICATIONS AND DISCONTINUED SPONTANEOUSLY WITH NO CREW ACTION REQUIRED. TESTED FIRE WARNING SYSTEM SEVERAL TIMES, OPS CHECK NORMAL AT THIS TIME REF B727-200 MM CHAP 26-11-001.