What was found
RIGHT N1 VIBRATION OF 5.0 OR HIGHER WITH NOTICABLE VIBRATION. DEBRIEFED CREW. STATED N1 VIBE WAS AT 5.0 THROUGHOUT CRUISE. VIBE DECREASED WHEN POWER ADDED TO ABOUT 3.0 & INCREASED BACK TO AROUND 5.0 WHEN POWER REMOVED. CREW STATED VIBRATION NOTICEBLE PHYSICALLY & AUDIBLY, BEGAN DURING T/O ROLL. NOTED THAT ALL OTHER ENG INDS NORMAL. INSPD NR 2 ENG. FOUND 13 FAN BLADES SHINGLED IAW FIM TASK 71-05 FAULT TREE 805. PERFORMED BLOCKS 1,2 AND 2A, NO SIGNS OF FOD FROM INLET OR EXHAUST ON NR 2 ENG ,INLET CONE SEAL GOOD , PERFORMED BLOCK 15 ON SHT 2, NO SIGNS OF DAMAGE ON BLADES SHROUDS, IAW AMM TASK 72-00-00-820-801-N00 FAN UNSHINGLING PROCEDURE. PERFORMED BLOCK 25 ON SHT 2, FAN BLADES SHROUDS LUBED IAW AMM 72-31-99-603-003-N00.