What was found
NR 2 ENG FIRE WARNING CAME ON DURING DESCENT. AFTER SHUTDOWN LIGHT WENT OUT, THEN CAME BACK ON WITH BELL SEVERAL MINUTES LATER. DISCHARGED ONE FIRE BOTTLE, LIGHT REMAINED ON. FIRED REMAINING BOTTLE, LIGHT REMAINED ON UNTIL AFTER LANDING THEN WENT OUT. REMOVED AND REPLACED BOTH FIRE BOTTLES ON LEFT WING IAW MM 26-4-1, OPS CHECK GOOD.