As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-10 CHECK CORROSION WAS FOUND AT NUT PLATE HOLES ON UPPER SURFACE OF AFT CARGO DOOR SILL FLOOR SUPPORT FRAME BETWEEN BS 1380 AND BS 1410. MAINTENANCE REMOVED CORRODED AFT CARGO DOOR SILL FLOOR SUPPORT FRAME FROM BS 1380 TO BS 1410; FABRICATED A NEW REPLACEMENT FLOOR SUPPORT; AND INSTALLED REPAIR PART IAW BOEING 757 SRM 51-40-02.