What was found
SIN - FLT 878 - NR 2 FIRE WARNING ILLUMINATED IN FLIGHT. LIGHT EXTINGUISHED WITH POWER REDUCTION TO IDLE, FIRE TEST SYSTEM NORMAL, L/P 7904361. MAINTENANCE OPEN NR 2 ENGINE COWLS. INSPECTED ENGINE AND FIRE DETECTION AND SENSORS FOR IRREGULARITIES, NONE NOTED. RAN ENGINE WITH HIGH POWER SETTINGS. NOTICED 2 PNEUMATIC LEAKS NEAR LOOP AND OH SENSOR. RECLAMP ENGINE PURGE BLEED LINE AND REPLACED FORWARD CSD PNEUMATIC TUBE GASKET. AS PRECAUTION, REPLACED ENG LOOP PER MM 26-11-22. ALL CHECKS NORMAL. RELEASED AIRCRAFT FOR SERVIEC WITH NO FURTHER INCIDENT. (M)