As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLOOR SUPPORT CORROSION LOCATION: STA 1661-1681, LBL 52 TOP AND BOTTOM OF FASTENER HOLES MARKED POS: CN REMOVED FLOOR SUPPORT (699498 27MAR12) DRILLED UP NEW SUPPORT AND INSTALLED STANDOFF CLIP PER B757 DWG 146N5230. INSTALLED NEW FLOOR SUPPORT PER B757 DWG 146N5230.