What was found
AT FL 380, ROUGHLY 30 SECONDS AFTER REDUCING TL TO CRUISE SETTING A SIGNIFICANT VIBRATION WAS FELT THROUGHOUT THE AIRFRAME. REPLACED LT ENGINE ASSY IAW AMM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AT FL 380, ROUGHLY 30 SECONDS AFTER REDUCING TL TO CRUISE SETTING A SIGNIFICANT VIBRATION WAS FELT THROUGHOUT THE AIRFRAME. REPLACED LT ENGINE ASSY IAW AMM.