As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*** SUPPLEMENTAL SDR *** HIGH N1 VIBE INDICATION IN LEFT ENGINE REMOVED ALL EXISTING TRIM BALANCE BOLT ASSEMBLIES AND REPLACED WITH STANDARD BOLTS IN POSITION 5, 9, AND 13 IAW AMM 71-00-00-705-446-R03. PERFORMED TRIM BALANCE SURVEY TEST WITH ENGINES N1 @ 92% AMP 1.7 @ 87% AMP 2.24 @ 82% AMP 2.37 AND 75% AMP 2.20. AMPLITUDES ARE WITHIN LIMITS WITH REFERENCE TO TEST 6 AMM 71-00-00-715-327-R03.