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 A INCREASE IN LOW PRESSURE ROTOR VIBRATION LEVELS. DATA SCATTER INDICATES FAN LUBE REQUIRED. GROUNDED-YES. ACCOMPLISHED FAN BLADE LUBE ON NR 1 ENGINE, PER T/C 78472010. REMOVED AND REPLACED 9 FAN BLADE SPACERS, DUE TO ELASTOMER BEING LOOSE. NO OTHER DEFECTS NOTED.