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 REQUIRED. ACFT GROUNDED. PERFORMED FAN LUBRICATION TC NR 78472002 AND REPLACED ALL FAN BLADE SPACERS ON NR 2 ENGINE IAW T/C 78472002. SPACER PN 340-001-261-0 INSTALLED.