As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF THE AFT HINGE FITTING PREVENTATIVE MODIFICATION, ECO F1566, ON THE NR 1 PYLON ONE FASTENER HOLE THROUGH THE FITTING & STRUCTURE WAS OVERSIZED & HFEC INSPECTED. REMOVED CRACK BY ENLARGING HOLE, VERIFIED CRACK REMOVAL BY HFEC INSPECTION, INSTALLED FREEZE PLUGS & INSTALLED REPAIR DOUBLER IAW EA B757-54-032771.