What was found
DURING CLIMB, FIRE BELL SOUNDED FOR APPROXIMATELY ONE SECOND WITH NO ASSOCIATED FIRE LIGHT IN HANDLE OR MASTER FIRE LIGHT. FIRE WARNING TEST WAS PERFORMED FOR ALL ENGINES AND ALL TESTED NORMALLY. COULD NOT DUPLICATE. CHECKED PNEUMATIC SYSTEM, FOUND NO LEAKS OR DEFECTS. CHECKED UPPER AND LOWER LOOPS FOR DEFECTS, NO DEFECTS NOTED. FIRE WARNING OPS CHECKED GOOD IAW DC-8 MM CHAPTER 26.