As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO COMPARTMENT LONGITUDINAL FLOOR SUPPORT ASSEMBLY B/N STA 727I AND 847, S-25L & S-26L HAS MULTIPLE CORROSION SPOTS. GROUNDED - YES. DAMAGE FOUND TO BE CORRODED THROUGH WITH 100 PERCENT MATERIAL LOSS. FOUND TO BE OUT OF LIMITS IAW B737-900 SRM 53-60-53-01-2. MATERIAL ID FOR REPAIR PARTS IS BAC1496-377, 7075-T62 PO 1120674.1. PERFORMED SPLICE REPAIR IAW B737-900 SRM 53-00-53-2R-6.