What was found
DURING TAKEOFF ROLL, AT ACHIEVING TAKEOFF THRUST, ABOUT 30 KNOTS, EICAS MESSAGES FOR ENGINE FAIL RIGHT AND ENGINE CONTROL RIGHT DISPLAYED, THERE WAS A LOUD BANG, INDICATING A POSSIBLE COMPRESSOR STALL. FLIGHT ATTENDANTS ALSO REPORTED A FIRE BALL OUT OF THE RIGHT ENGINE. NO FIRE WARNINGS OR INDICATIONS PRESENT. MAXIMUM EGT NOTED WAS 700. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED THE RIGHT ENGINE IAW MCM 71-96-11, AND PERFORMED A SATISFACTORY OPERATIONAL CHECK.