As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON VERTICAL FIN ATTACH REINFORCEMENT CHANNEL, THE BOLT HOLES THAT ARE USED TO SECURE RUDDER HINGE CASTING C2FS3705ND WERE FOUND TO HAVE CRACKS RADIATING FROM THEM. LACK OF A CONTROL SURFACE LOCK AND HIGH WINDS OVER WINTER MAY HAVE CONTRIBUTED TO CRACKING.