As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING ASA T/C 78472010 FOUND BLADES 21, AND 22 HAVE CU-NI-IN COATING MISSING APRON MEASURING IT IS NOT WITHIN LIMITS BLADES NEED TO REPLACED. GROUNDED - YES. REMOVED & REPLACED BLADES 21 & 9 AS A PAIR IN REF WITH ASA T/C 78472010.