What was found
ON REPOSITION TO THE FLY AWAY, A LOUD BANG WAS HEARD FOLLOWED BY A NOTICEABLE CHANGE AND A VIBRATION IN THE AIRCRAFT. AC FELT UNSTABLE AND WAS SET DOWN. DURING COAST DOWN/ SHUTDOWN AC CONTINUED TO HAVE ODD VIBRATION/ OSCILLATION. MAINTENANCE NOTIFIED. REMOVED AND REPLACED ENGINE ASSY IAW MM AND THE APPLICABLE STC. WORK ACCOMPLISHED 8/28/2005. COMP, GRIND NOISE, OIL PUMP. (K)