As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSMISSION DISASSEMBLED FOR OVERHAUL. PERFORMED MAGNAFLUX INSPECTION OF MAST FOLLOWING STRUCTURAL FAILURE IN ANOTHER AIRCRAFT; .3750 INCH CRACK INDICATION FOUND BEGINNING AT DOWEL PIN HOLE TO UNDERCUT AT MAST BASE. AIRCRAFT HAS BEEN LOGGING FOR THE LAST 1146 HOURS.