What was found
LEVEL FLIGHT, HEARD BOOM NOISE, FELT MOMENTARY HEAVY RUMBLE, AND YAW TO THE RIGHT. NR 3 ENGINE FAILED. COMPLIED WITH QRH. DURING DESCENT, N1-21 EGT-30 N2-10.5 FF - 0 OIL PRESS - 1 OIL TEMP - 60 OIL QTS - 16. FAILED BORESCOPE, REPLACED THE ENGINE.