As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATIONS/IFSD DURING CLIMB THROUGH FL260, SUDDEN VIBRATIONS WERE FELT. LT ENGINE VIBRATION WENT TO FULL SCALE. WHEN ENGINE WAS SELECTED TO IDLE, VIBRATIONS DECREASED. PRECAUTIONARY SHUTDOWN WAS PERFORMED AND AN UNEVENTFUL SINGLE-ENGINE LANDING WAS ACCOMPLISHED. POST FLIGHT INSP REPORTED POWER TURBINES BLADE DAMAGE.