What was found
(CAN) DURING TAKEOFF RUN, 10 KT BEFORE V1, THE FIRE ALARM ON ENGINE NR 2 CAME ON. THERE WAS SMOKE ON ENGINE EXHAUST BUT NO FIRE WAS VISIBLE. PILOT FIRED THE FIRE EXTINGUISHERS AND ABORTED TAKEOFF. ACFT WAS TAKEN TO HANGAR WHERE DAMAGE WAS NOTICED ON POWER TURBINE AND EXHAUST. ENGINE WAS REMOVED AND A SPARE ENGINE INSTALLED. ACFT WAS RETURNED TO SERVICE.