What was found
LEFT ENGINE FIRE DETECTOR LOOP B ILLUMINATED DURING FLIGHT. SWITCHED TO LOOP A AND ACCOMPLISHED A GOOD TEST. LEFT SWITCH IN LOOP A AS PER PROCEDURE. PULLING INTO GATE AT SJC LEFT ENGINE FIRE LIGHT AND BELL ILLUMINATED. SHUT DOWN ENGINE, PULLED FIRE HANDLE, FIRED BOTH BOTTLES. LIGHT REMAINED ILLUMINATED. GROUND CREW REPORTED A SMALL AMOUNT OF SMOKE COMING FROM TOP OF ENGINE AFTER FIRING BOTTLES. UPON INVESTIGATION, MAINTENANCE DETERMINED THERE WAS NO ACTUAL FIRE. MAINTENANCE FOUND UPPER FIRE DETECTOR LOOP A AND B BAD. REPLACED UPPER FIRE DETECTOR LOOP A AND B. PERFORMED FIRE DETECTOR TEST AS REQUIRED. REMOVED AND REPLACED NR 1 AND NR 2 FIRE EXTINGUISHER, INSTALLED SQUIBB, FIRE SYSTEM TEST OK PER MM.