As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED MX INSP, WHILE PERFORMING A BOROSCOPE INSP OF THE HORIZ STABILIZER RIBS, SEVERAL CRACKS WERE FOUND ON RIBS IN THE LT AND RT SIDES OF THE HORIZ STABILIZER. THE CRACKS WERE FOUND ON THE ATTACHMENT FLANGES FROM THE RIBS WHERE THEY ARE RIVETED TO THE SKIN. MX CONFIRMED 18 SEPARATE CRACKS ON 6 OF THE CANTED RIBS. ALL CRACKED RIBS WERE REPLACED.