What was found
MSY - FLT 978 - MIA-IAH - EN ROUTE IAH AT CRUISE, RT ENGINE LOST POWER ASSOCIATED WITH VIBRATION. PILOT DECLARED EMERGENCY AND LANDED MSY WITHOUT INCIDENT. TOWER REPORTED RIGHT ENGINE ON FIRE. EMERGENCY EVACUATION INITIATED. THERE WERE NO ENGINE FIRE WARNING LIGHTS IN COCKPIT. FIRE CREWS DETERMINED THERE WAS NO ENGINE FIRE. EMERGENCY EVACUATION CANCELED. REMOVED AND REPLACED RIGHT ENGINE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)