As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) MAINTENANCE TECHNICIANS WERE REPLACING A BROKEN HEADREST EXTENSION SPRING WITH A NEW PART WHEN THE NEW PART FAILED. THE NEW SPRING SUPPLIED BY CESSNA WAS FOUND TO BE EXTREMELY BRITTLE AND WOULD BREAK IF DEFLECTED. A CALL TO CESSNA CUSTOMER SUPPORT CONFIRMED THAT THE SPRINGS HAD BEEN MANUFACTURED INCORRECTLY.