As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHDULED INSPECTION, MX FOUND 8 RIBS CRACKED IN THE HORIZ STABILIZER. EA CRACK WAS FOUND TO BE EMINATING OUTWARD FROM A FASTENER HOLE ON THE ATTACHEMENT FLANGES OF THE RIBS WHERE THE BLIND FASTENERS WERE INSTALLED ON THE LOWER SKIN. ALL 8 RIBS WERE REPLACED IAW KIT 128-6200-1.