What was found
DURING CRUISE FROM MCI, FLIGHT 9021, NR 3 ENGINE FIRE WARNING LIGHT CAME ON, SHUT DOWN NR 3 ENGINE AND DISCHARGED FIRE EXTINGUISHING BOTTLE, LIGHT REMAINED ON. A SECOND BOTTLE WAS ALSO DISCHARGED, AIRCRAFT DIVERTED TO SPI AND LANDED WITHOUT INCIDENT. FOUND NR 3 FIRE CONTROL UNIT DEFECTIVE, REPLACED UNIT PER SAT J/C 2609 AND REPLACED 2 FIRE EXTINGUISHER PER SAT J/C 2604 OPS CHECKED GOOD.