As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL AT APPROXIMATELY 120 KNOTS, ENGINE FIRE WARNING HORN SOUNDED WITH NO VISUAL INDICATIONS. ABORTED TAKEOFF WITHOUT FURTHER INCIDENT. DETERMINED FALSE WARNING INDICATION AND MAINTENANCE REPLACED NR 1 ENGINE TEST POWER UNIT. OPERATIONAL CHECK WAS NORMAL.