As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE DAMPER ASSY D41-3223-20-00G WAS DISASSEMBLED TO REPLACE WORN RUBBER ELEMENTS. IT WAS DISCOVERED THAT THE LOWER END OF THE DAMPER ROD THAT HOLDS THE ASSY TOGETHER HAD BEEN SEVERELY WORN AND WAS BEYOND LIMITS. IT APPEARS THAT THE LOWER DAMPER PLATE (DAMPER PLATE III AND DAMPER PLATE I) HAVE BEEN SLIDING AGAINST THE DAMPER ROD CAUSING THE DETERIORATION.