As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED MX EVENT, WHILE PERFORMING A BOROSCOPE INSPECTION OF THE HORIZONTAL STABILIZER RIBS, SEVERAL CRACKS WERE FOUND ON SEVERAL 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 RIVITED TO THE SKIN. SDR WILL BE UPDATED UPON COMPLETION OF THE CORRECTIVE ACTION.