What was found
IND - FLT 1057 - EN ROUTE, CREW EXPERIENCED HIGH VIBRATION ON THE LEFT ENGINE. CREW WAS ABLE TO CONTROL THE VIBRATION BY REDUCING THE ENGINE EPR. VIBRATION RETURNED DURING DESCENT. FLIGHT DIVERTED TO IND AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE CHECKED THE ROTATING FAIRING OF TRAPPED MOISUTRE AND FOUND NONE. ENGINE WAS INSPECTED AND VIBRATION SURVEY PERFORMED. NO PROBLEMS WERE FOUND. AIRCRAFT RELEASED FOR SERVICE. (M)