As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOLT WAS SENT FOR NDT AS PART OF THE 2200HR AIRCRAFT OVERHAUL. THE CRACK WAS FOUND ON THE MOUNTING TANGS THAT ARE PART OF THE BOLT HEAD. THIS CRACK COULD NOT BE SEEN BY A NORMAL VISUAL INSPECTION. THIS IS NOT THE FIRST TIME THIS BOLT HAS BEEN FOUND CRACKED DURING THE 2200 HR OVERHAUL.