As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FRACTURE INITIATED TWO THREADS ABOVE SHANK AND AS BOLT WAS BROUGHT UP TO APPROXIMATELY 100 FEET\POUNDS, IT BROKE INTO TWO PIECES. FRACTURE AREA APPEARED CRYSTALIZED AND DARK GREY IN COLOR. HAMILTON STANDARD AND BOSTON ACO WERE NOTIFIED.