As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L/H AFT CABIN BETWEEN STA 907 AND STA 927 FLOOR SUPPORT STRUCTURE UPPER SURFACE HAS CORROSION. GROUNDED - YES. REMOVED CORROSION AREAS IAW B737-800 SRM 51-10-02. PART FOUND TO BE OUT OF LIMITS 100% MAT LOSS. REMOVED AND REPLACED NEW FLOOR SUPPORT STRUCTURE IAW B737-800 SRM 51-40-02 AND BAC DWG# 147A5680 REV:-.