As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTICED HIGH VIBRATION FROM LEFT ENGINE AT TAKEOFF. IN CRUISE, LEFT ENGINE SHOWS VIBRATION N1 VARIABLE BETWEEN 3.7 & 4.1 @ FL350. ACCOMPLISHED FAN LUBE PER B767 AMM 72-31-02, MID SPAN SHROUD LUBE WAS PERFORMED PER WO 1223028 TC 767-72-433-01-01