As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCIDENT INVESTIGATION, FOUND TOP BULKHEAD RING SEPARATED FROM TAILBOOM PYLON. TAIL ROTOR GEARBOX WAS STILL ATTACHED TO BULKHEAD RING. BULKHEAD RING HAD SEPARATED FROM RIVET FLANGE AT TRANSITION RADIUS DUE TO EXISTING CRACKS ON THE LEFT AND RIGHT SIDES. INSPECTION CAN BE ACCOMPLISHED THROUGH LIGHTENING HOLE OF BULKHEAD.