What was found
PDIS 940 26-10 7568 30MAR21 JAX FACT U AT CRUISE GOT INTERMITTENT L ENGINE FIRE WARNINGS. ALL ENGINE INDICATIONS AND AIRCRAFT PERFORMANCE NORMAL. AFTER APPROXIMATELY 3 MINUTES OF INTERMITTENT WARNINGS THEY STOPPED AND DID NOT OCCUR AGAIN DURING THE REMAINDER OF THE FLIGHT. FACT 30MAR21 10:33 JAX U REF B757 FIM 26-11-00 FT 802 FIG 103, PULLED AND REINSTALLED AFOLTS CARD REF B757 M.M. 26-10-01-4-0. FIRE SYSTEM TEST NORMAL AT THIS TIME. NOTE: MEL STILL IN PLACE FOR DEFERRED LOOP.