As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE WARNING FLASHED ON TAKEOFF ROLL. LOOP FAULT ON ALL 4 ENGINES ON LOOP A, WENT AWAY WHEN SWITCH TO LOOP B. MAINTENANCE FOUND PCB WAS CONTAMINATED. REPLACED PCB, ALL CHECKS GOOD IAW 26-11-00 501, P/N 5234-02, S/N OFF 911, S/N ON 875.