As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE TREND DATA SHOWS LOW PRESSURE ROTOR VIBRATION LEVELS TO BE TRENDING HIGHER THAN EXPECTED CURRENT LEVELS NEAR 1.2 UNITS. ACCOMPLISHED ON NR 1 ENG ON BOARD FAN TRIM REF MM 71 00 00 750 803 FOO. FOLLOWING BALANCE WEIGHT CHANGES: NR 10 PO11 TO P07 NR 24 P07 TO PO13 NR 33 PO7 TO PO13 AND NR 36 PO11 TO P07.