As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING START ATTEMPT, THE POWER SECTION DID NOT ROTATE WHEN THE NG REACHED 13 PERCENT. START WAS ABORTED AND PROPELLER TURNED BY HAND. A NOISE WAS HEARD FROM THE EXHAUST STACK AND DRAGGING/BINDING WAS FELT. POWER SECTION WAS REMOVED AND SENT FOR TROUBLESHOOTING AND REPAIR. DURING REMOVAL OF THE PT WHEELS, IT WAS FOUND THAT THE PT SHAFT FRACTURED AT THE THREADS FOR THE PT WHEEL RETAINING NUT. THIS ALLOWED THE 1ST STAGE PT WHEEL TO SHIFT AND THE BLADE SHROUD SEAL FINS RUB ON THE PT STATOR.