As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING 100-HOUR INSPECTION AND AD 80-11-04 (VERTICAL FIN ATTACH NUTPLATE), FOUND ATTACH BRACKET CRACKED IN 5 PLACES. NUTPLATES WERE IN GOOD CONDITION. BRACKET WAS REPLACED. SUBMITTER SUGGESTS THE AREA SHOULD BE CLEANED VERY WELL BEFORE INSPECTION IS MADE AS THESE CRACKS ARE VERY DIFFICULT TO SEE.