As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON REPLACEMENT OF HYDROLOK SEAT BACK ADJUSTMENT, IT WAS DISCOVERED THAT BOLT INSTALLED WAS TOO SHORT I WRONG P/N. AS A RESULT THE BOLT THREADS WERE NOT IN SAFETY OR FULLY ENGAGING NUT. ALL SEATS ON AIRCRAFT FOUND WITH SAME DEFECT. ONE SEAT BACK BOLTS REPLACED IAW CMM.