As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE ARMATURE DRIVE SPLINE WAS FOUND ALMOST COMPLETELY STRIPPED AWAY LEAVING SHARDS OF STEEL IN THE GEAR HOUSING THAT CONTAMINATED THE BEARINGS. THE BENDIX DRIVE END WAS UNDAMAGED AND THE SHEAR PIN DID NOT SHEAR. THE ARMATURE DRIVE END MAY NOT BE PROPERLY HEAT TREATED OR SHEAR PIN MAY BE TOO HARD. SUBMITTER STATED THIS IS THE SEVENTH ARMATURE FOUND IN THIS CONDITION. (X)