As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TROUBLESHOOTING, AN AUTO PILOT PORPOISE DISCREPANCY, THE TECH PULLED ON A PRIMARY RUDDER CABLE IN THE TAIL CONE AND IT SNAPPED. THE CABLE HAS BEEN BROKEN EXCEPT FOR A FEW STRANDS. IT APPEARS THE CABLE WAS NOT RIDING IN A PULLEY AND WAS CHAFING ON THE UPPER CABLE GUARD. INCORRECT ROUTING MAY HAVE BEEN THE ROOT CAUSE FOR THE POTENTIAL FAILURE. 2 SETS OF EYES AR CRITICAL WHEN WORKING ON PRIMARY FLIGHT CONTROL SYS AND CRITICAL ACFT COMPONENTS.