What was found
ETOPS - INFO TO MX: DURING LEVEL OFF FL390 ADV MESSAGE N1 VIBRATION PEAKED AT 4.2 UNITS. IN CRUISE DECREASED TO 1.2. DURING ENROUTE CLIMB VIB1 4.7 UNITS. PERFORMED SINGLE SHOT TRIM BALANCE SOLUTION PER POWER PLANT ENGINEERING, REMOVE TRIM BALANCE BOLTS INSTALLED AT POSITIONS 8, 9, 10, AND 11 AND INSTALLED STANDARD SCREWS (PN PSC738-6413) AT POSITIONS 8, 9, 10 AND 11 PER AMM 71-00-00-700-848-A STEP 4.C AND 4.D. ACCOMPLISHED ENGINE IDLE RUN. NO FAULTS NOTED. OK FOR SVC