What was found
NR 1 ENG VIBRATION INDICATION. VIBRATION HIT 5.5. VIBRATION NOTED THROUGH AIRFRAME BY AIRCREW, SUGGESTS NOT AN INDICATION ISSUE. PERFORMED TEST NR 12A, LOW PRESSURE SYSTEM TRIM BALANCE OF NR 1 ENGINE REF 71-00-00-700-812-G00 AND CHANGED FAN BALANCE WEIGHTS. NEW CONFIGURATION IS P08 AT HOLE 37, P08 AT 36, P04 AT 35, P02 AT 6, & ALL REMAINING WEIGHTS P01. NEW CONFIGURATION SAVED TO AVM. PERFORMED TEST NR 10 LOW PRESSURE SYSTEM VIBRATION SURVEY OF NR 1 ENG IAW AMM 71-00-00-700-810-G00. VIBRATION NOW WITHIN LIMITS WITH MAX PEAK OF 0.6 UNITS AT 80% N1. E1 FAN BALANCE WEIGHT CORRECTION: CURRENT CONFIGURATION IS P08 AT HOLE 37, P08 AT 36, P08 AT 11, P02 AT 6, & ALL REMAINING WEIGHTS P01 IAW AMM 71-00-00-700-812-G00.