What was found
AFT CARGO COMPARTMENT LONGITUDINAL FLOOR SUPPORT ASSEMBLY B/N: STA 727A & 727I, S-25L & S-26L, HAS MULTIPLE CORROSION SPOTS. GROUNDED - YES. DAMAGE FOUND TO BE CORRODED THROUGH IN MULTIPLE LOCATIONS WITH 100% MAT LOSS. FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-60-53-01-2. REMOVED TRANSITION FLOOR SUPPORT IAW B737-900ER SRM 51-40-02. LOCATED AND DRILLED NEW TRANSITION FLOOR SUPPORT AND FABRICATED REPAIR PARTS IAW B737-900ER SRM 53-00-53-2R-6. B DWG 146A7502 AND B737-900ER SRM 51-40-05. APPLIED PROTECTIVE TREATMENT TO TRANSITION PANEL/REPAIR PARTS IAW B737-900ER SRM 51-20-01. INSTALLED REPAIR PARTS AND NEW TRANSITION PANEL IAW B737-900ER SRM 51-40-02, SRM 53-00-53-2R-6 AND B DWG 146A7502.