As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3014 - IN CRUISE FLIGHT FROM DTW, THE LEFT ENGINE FIRE LIGHT FLASHED MOMENTARILY IN FLIGHT. THE AIRCRAFT RETURNED DTW. MAINTENANCE REPAIRED CHAFED WIRES 393005B-22 AND 393005E-22. SYSTEM OPERATED SATISFACTORILY. THE FIRE EXTINGUISHER LOGIC MODULE WAS ALSO REPLACED FOR PRECAUTIONARY MEASURES. (W)