As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO ONGOING VIBRATION ISSUES ON #2 ENGINE. REQUEST FAN SET REPLACEMENT. TASK CARD 78472010 FAN BLADE ULTRA INSP REQUIRED. GROUNDED - YES. REMOVED AND REPLACED FAN SET PER B737-800 AMM 72-21-02. ACCOMPLISHED VIBRATION SURVEY AND FAN TRIM BALANCE PROCEDURE. VIBRATION SURVEY GOOD. NO OTHER DEFECTS NOTED. REF TC 78472010, TSR714105, TSR714134, TSR714149.