What was found
THE NR 2 ENGINE BEGAN TO VIBRATE WITH N1 DROPPING OFF TO 40 PERCENT DURING CLIMB-OUT OF CLE. THE AIRCRAFT WAS RETURNED TO CLE WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND METAL IN THE NR 2 ENGINE TAILPIPE. THE NR 2 ENGINE WAS REMOVED AND REPLACED. THE SDR WILL REMAIN OPEN FOR PART INFORMATION PENDING INVESTIGATION. SHOP FINDINGS REVEALED TWO BROKEN FIRST STAGE TURBINE BLADES DUE TO IMPACT.