As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO. 2 ENGINE FAN VIBRATION LEVEL INCREASES BETWEEN FL200 TO FL340 BETWEEN MAT VALVES OF 3.0 TO 4.0. ALSO DURING INTERMEDIATE CLIMB ABOVE FL340.(<P>ACCOMPLISHED VIBE SURVEY IAW 767 AMM 71-00-00 TEST #6. AT MPA VIBES WERE THE HIGHEST #1 ENG VIBE WAS FAN AT 1.2 AND #2 ENG VIBE WAS FAN AT 2.3. WITHIN LIMITS IAW 767 AMM 71-00-00. OK FOR SERVICE.</P>)