As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A C-CHECK INSPECTION, THE PILOT'S SEAT BACK ON THE LEFT ATTACH POINT, THE SPACER TUBE WAS FOUND BROKEN. SUSPECT THE BOLTS WORKED LOOSE ALLOWING ADDITIONAL STRESS TO BE PLACED UPON THE SPACER TUBE. CHECK OF THE BOLTS DURING INSPECTIONS BY VISUAL AND WITH WRENCH TO ENSURE THE BOLTS REMAIN TIGHT.