As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THESE PARTS WERE REMOVED FROM SERVICE AT ENGINE TSO OF 2824.2 HOURS. THE FOLLOWING PARTS (COMPRESSOR DISKS) WERE DEEMED SCRAP DUE TO NOT BEING ABLE TO READ PN AND/OR SN BECAUSE OF CORROSION. SUSPECT THAT THE CAUSE OF EXCESSIVE CORROSION IS THE WINDAGE TABS NOT BEING ADEQUATELY COATED. (K)