As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE A FASTENER HOLE COMMON TO THE RIGHT HAND HORIZONTAL STABILIZER ELEVATOR HINGE RIB WAS MISDRILLED RESULTING IN A DOUBLE HOLE CONDITION. THE DISCREPANT HOLE WAS OVERSIZED TO A CLEAN ROUND CONDITION AND A FREEZE PLUG WAS INSTALLED PER TIMCO REPAIR INSTRUCTIONS. THIS REPAIR WAS APPROVED WITH AN 8110-3 BY TIMCO'S DER.