As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT FUSELAGE FLOOR STURCTURE AT BS 1309 HAS CORROSION ON UPPER SURFACE UNDER SMOKE TAPE BETWEEN RT AND LT HAT CHANNNELS. REMOVED CORROSION FROM FLOOR SUPPORT IAW SRM 51-10-3, FOUND TO BE OUT OF SRM LIMITS. FABRICATED REPAIR FLOOR SUPPORT REPAIR PARTS IAW SRM 51-10-4 PG 1-3. INSTALLED FLOOR SUPPORT IAW SRM 51-30-5.