As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK FLOORBEAM FR13 WAS BEING REPLACED. DURING THE INSTALLATION THE OEM DESIGNED CONTROL CABLE GUIDE THROUGH-HLOES WERE ACCIDENTALLY DRILLED ON THE WRONG (OPPOSITE) SIDE OF THE BL0. REPAIRED IAW STS EA 09-2011-227. REPAIR PERFORMED BY TECH SERVICE UNDER W/O 17077.