As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT INITIAL CRUISE FLIGHT, NR 2 ENG FAN REACHED APPROX 3.5 VIBRATION. AOM VOL 1 PROCEDURE FOLLOWED. REDUCTION IN THRUST EVENTUALLY HELPED A BIT. FOLLOWED PROCEDURE IN AMM 22-21-02 & PERFORMED THE VIBRATION CHECK IAW 71-00-00. PERFORM BLADE LUBE WITHIN 50 F IAW TDMI 523T7721.