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 SUDDEN INCREASE IN LOW PRESSURE ROTOR VIBRATION LEVELS. CHECKED INLET AND EXHAUST FOR EVIDENCE OF FOD IAW MM 71-00-00-800-802. ACCOMPLISHED NR 1 ENGINE FAN LUBE IAW TASK CARD 78472002. INSPECTED ALL PLATFORM SEALS AND HARDWARE FOR IRREGULARITIES. REPLACED ALL SHIMS NO OTHER DEFECTS NOTED.