As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OVERHAUL OF THE MAIN ROTOR HEAD, A FLUORESCENT MAGNETIC PARTICLE INSPECTION REVEALED A TOTAL OF 4 CRACK INDICATIONS IN BOLT HEAD TO SHANK RADIUS. LARGEST CRACK IS 0.200 INCH IN LENGTH RADIALLY AROUND SHANK. THREE SMALL CRACKS ARE 0.040 INCH LONG EACH. NO REASON FOR THE CRACKING IS APPARENT.