As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOPLISHING T/C 78472002 FOR FAN BLADE LUBRICATION, FOUND THE FAN BLADE SHIM'S COATING TO WORN ON THE NR 1 ENGINE. ACFT GROUNDED. INSTALLED NEW FAN BLADE SHIMS IAW T/C 78472002. REPLACED ALL 24 FAN BLADE SHIMS ON THE NR 1 ENGINE.