As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO NP OR TORQUE INDICATION AFTER ENGINE START. PROPELLER WAS NOT ROTATING. AFTER ENGINE SHUT DOWN THE PROPELLER COULD NOT BE TURNED BY HAND. WHEN ENGINE DISASSEMBLED, A BROKEN INTERSTAGE CASE BOLT WAS FOUND TO BE JAMMING THE 1ST STAGE POWER TURBINE DISK. BOLT AND POWER TURBINE WERE REPLACED AND ENGINE RETURNED TO SERVICE.