As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, LEFT ENGINE N1 VIBE REACHED 3.0. AT TOP OF CLIMB, ENG N1 REACHED 5.0. LASTED 6-7 MINUTES UNTIL TOP OF DESCENT. VIBRATION FELT IN COCKPIT. PERFORMED FIM 71-05FT 806 STEPS 1-4 NO DEFECTS NOTED. BORESCOPE REQUIRED. BORESCOPE FOUND HPC # 5-7 DAMAGED AND UNSERVICEABLE DUE TO LE TIP CURLS AND DENTS. ENGINE CHANGE REQUIRED.