As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD PIT STA 500I LATERAL FLOOR SUPPORT UPPER SURFACE CORRODED FROM LBL24 TO RBL24 AND W/L157 / EVALUATED CORROSION AT FWD PIT STA 500I FLOOR SUPPORT RAIL LBL 24 RBL 24 W/L 157 100% MATERIAL LOSS FOUND. NO PUBLICATION OF LIMITS WAS FOUND. REMOVED AND REPLACED FLOOR SUPPORT RAIL P/N 143A7485-33 TAG# WN8713 IAW B737 SRM 51-40-02-0G-0 AND DWG. 143A9481 REV-