What was found
AFT CARGO DOOR CUT OUT LOWER THRESHOLD HAS CORR. GROUNDED - YES. REMOVED CORROSION AND FOUND TO BE BEYOND ALLOWABLE LIMITS IAW ASA 737-800 SRM 53-60-15-1A-1 ORIGINAL MAT THICKNESS 0.045 IN REMAINING THICKNESS IS 0.039 MAT REMOVED IS 0.006 IN TOOL ID T8225M REMOVED AFT CARGO LOWER MAIN SILL WEB IAW ASA 737-800 SRM 51-40-02. DRILLED NEW WEB PO #902191.2 IAW ASA 737-800 SRM 51-40-05 AND BAC DWG 146A8340 REV- AND INSTALLED NEW WEB IAW B737-800 SRM 51-40-02 REMOVED DOT .