As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSP OF THE PILOT SEAT SUPPORT STRUCTURE FOUND P/N 5011011-7 GUSSETT, P/N 5015019-1, AND 5015019-3 CHANNELS HAD CRACKED AND FAILED. THERE IS NO ACCESS TO P/N 501101107 FOR INSPECTION AND IT IS BELIEVED THIS PART FAILED FIRST PUTTING HEAVY LOAD ON CHANNELS.