As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING MTC 78472010, FOUND NR 2 ENG FAN BLADE NR 13 WITH MISSING CU-NI-IM COATING. MISSING BEYOND ALLOWABLE LIMITS. 27MM ON THE CONCAVE SIDE CONTACT AREA. GROUNDED - YES. REPLACED NR 13 FAN BLADE ON NR 2 ENG. AND ITS PAIR NR 1 PER T/C 78472010.