What was found
CRACK FOUND IN BLADE PIN RETENTION HOLE OF 2ND STAGE COMPRESSOR DISK. COMPRESSOR (SN 677810) REMOVED FOR OVERHAUL. DURING INSPECTION PROCESS, NDT DETECTED A CRACK IN BLADE PIN RETENTION HOLE, CENTER LAND, USING EDDY CURRENT. CRACK VERIFIED BY FMPI. HOLDING THE DISK WITH THE PN ON THE DISK AT THE 7 OCLOCK POSITION, THROUGH CRACK BEGINS AT THE 12 OCKLOCK POSITION OF HOLE AND EXTENDS OUTWARD APPROXIMATELY .200 INCH TOWARDS OUTER EDGE OF LAND AT 45 DEGREE ANGLE. CRACK DOES NOT EXTEND TO OUTER EDGE OF LAND. PROBABLE CAUSE IS UNKNOWN.