As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOTS SHOULDER HARNESS INERTIA REEL LOCKED UP, UPON EXAMINATION THE METAL GUIDE WHICH SURROUNDS THE FABRIC AND GUIDES IT ONTO THE REEL, HAD RUBBED AGAINST THE CENTER SHAFT OF THE REEL ITSELF. THIS OVER TIME REDUCED THE DIAMETER OF THE SHAFT UNTIL IT FAILED.