What was found
JUST PRIOR TO ROTATION, DURING TAKEOFF ROLL, A/C SUDDENDLY BEGAN TO VIBRATE, AND DURING INITIAL CLIMB VIBRATION WAS DETERMINED TO BE COMING FROM NR 1 ENGINE. ENGINE WAS SHUTDOWN. [SUP 06-01-07] PERFORMED FULL BOROSCOPE INSPECTION AND FOUND COMPRESSOR SECTION BLADES TIP WITH SOME DENT WITH IN LIMITS IAW CF6-50 M/M 72-00-00. REMOVED AND REPLACED STG 1 FAN BLADES IAW DC-10-30 MM 72-21-00 AND R & R SPINNER IAW DC-10-30 M/M 72-21-00. ACCOMPLISHED VIBRATION CHECK AND FOUND NORMAL IAW DC-10-30 MM 72-00-00. MPA RUN CHECK NORMAL IAW DC-10-30 M/M 71-00-00.