What was found
NR 2 ENGINE RUMBLE WHEN MOVEMENT BETWEEN MIDRANGE AND IDLE ON THE THROTTLE QUADRANT VIBRATIONS FELT IN RUDDER PEDALS ON THE GROUND AND IN THE AIR ON DESCENT AND APPROACH TO LANDING NO IMPACT TO FLIGHT CONTROLS OR EICAS INDICATION. BLEEDS WERE CONFIGURED NORMAL, NO ENGINE EICAS OR INSTRUMENT ABNORMALITIES. THE RUMBLE ONLY CAME ON THE RETARDING OF THE THROTTLE. C/A: REF NRWC 667-ORD-03902 FOR CORRECTIVE ACTION. R & R OF NR 2 ENGINE, IAW EMB 145 W/C 71-000-00. OPERATIONS AND LEAK CHECK GOOD. NO FURTHER DEFECTS NOTED AT THIS TIME.