As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE TREND DATA SHOWS A SUDDEN INCREASE IN LOW PRESSURE ROTOR VIBRATION LEVELS. DATA SCATTER INDICATES FAN LUBE AND HARDWARE INSPECTION REQUIRED. ACFT GROUNDED. PERFORMED FAN BLADE LUBE ON NR 2 ENGINE. FOUND FOUR SPACERS DEBONDED AT 6, 12, 14 & 15. REPLACED THE SPACERS7. ALL SPACERS CAME OUT EASILY DURING DISASSEMBLY. COMPLETED VIBRATION SURVEY IAW AMM 71-00-00-700-814-F00. NO DISCREPANCIES NOTED.