As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, CREW REPORTED LEFT ENGINE FIRE LOOP 2 EICAS MESSAGE DISPLAYED. RETURNED TO BLOCKS. PREVIOUS HISTORY. *S/D* WIRE HARNESS ASSEMBLY 286W0656-002 WAS FOUND TO HAVE CHAFED INSULATION IN NUMEROUS SPOTS. ONE AREA ADJACENT TO WHERE THE SHIELDED GROUND EXITED THE INSULATION FOR TERMINATION HAD BEEN CUT THROUGH TO THE CENTER CONDUCTOR. THE LOOP MESSAGE HAD BEEN FOR A INTERMITTENT SHORT. THE HARNESS WAS REPLACED AND THE AIRCRAFT AND SYSTEM HAVE BEEN CLEAR.