As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 3 - AT CRUISE ALTITUDE, CREW RECEIVED EICAS MESSAGE, 'L ENG FIRE LP2'. THE LEFT FIRE LOOP NR 1 WAS ALREADY ON MEL. FLIGHT DIVERTED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE PERFORMED THE FIM PROCEDURE 926-11-00, FIG 104) AND COULD NOT DUPLICATE THE PROBLEM. AFOLTS CARDS WERE SWAPPED (LEFT TO RIGHT) PER THE FIM. (M)