As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE INSPECTION, CRACKS DETECTED IN UPPER LEFT BULKHEAD FLANGE RADIUS ABOVE RUDDER STOP. SUBJECT IS COVERED BY CESSNA SL 72-3 AND AD 72-07-09. SUSPECT CAUSE IS YEARS OF RUDDER STOP CONTACT. SUBMITTER STATED THIS TYPE OF CRACK MAY BE ELIMINATED BY THE USE OF EXTERNAL CONTROL LOCKS.