What was found
CAPTAIN REPORTED A LOUD BANG. THE NR 2 ENGINE VIBRATION WAS HIGH, NR 2 ENGINE WENT TO IDLE. EMERGENCY DECLARED AND LANDED. TOWER REPORTED A NR 2 ENGINE FIRE. NR 2 ENGINE, STOPPED ON RUNWAY AND FIRE BOTTLES DISCHARGED NR 2 ENGINE AS A PRECAUTION. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED NR 2 ENGINE IAW AMM 72-05-00, AND JC 26L40071001. PERFORMED A SATISFACTORY OPS CHECK, NO LEAKS NOTED.