As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RUDDER TORQUE TUBE CRACKED WHERE LOWER FLANGE IS WELDED TO TUBE. CRACK EXTENDS APPROXIMATELY 20 PERCENT OF THE CIRCUMFERENCE. AT REMOVAL IT WAS DISCOVERED THAT A GROOVE WAS WORN BY THE PHENOLIC TORQUE TUBE SEAL OF UP TO 30 PERCENT OF THE TUBE WALL THICKNESS. FOUND DURING UNRELATED MAINTENANCE.