As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL OF SUBSTRUCTURE FOR STA 986 T-CAP REPAIR, ADDITIONAL CORROSION FOUND ON FLOOR SUPPORT RBL 32 -RBL 45 STA 992. GROUNDED - YES. REMOVED CORROSION 100% MATERIAL LOSS OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1 & DRILLED TO FIT NEW FLOOR SUPPORT IAW B737-800 SRM 50-40-05 AND BAC DWG 147A5700REV- SUPPORT INSTALLED ON G1817380.