As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING #2 ENGINE FAN LUBE ASA T.C 78471010 FOUND #15 FAN BLADE COATING LOSS ON CONCAVE SIDE PRESSURE FACE (AREA X) OUT OF LIMITS. REF B737-900 AMM 72-21-02. GROUNDED - YES. REPLACED DISCREPANT BLADE #15 & ITS PAR #3, SEC ASA L/P 60369081 FOR TEST 7 VIBRATION SURVEY REQUIREMENT REF B737-900 AMM 72-21-02.