What was found
FWD CARGO COMPARTMENT DOOR SILL SKIN HAS SEVERAL AREAS OF LIGHT SURFACE CORROSION ALONG LENGTH OF OPENING. MARKED IN RED. GROUNDED - YES. REMOVED CORROSION ON CORRODED AREAS ON FWD CARGO DOOR SILL WEB IAW B737-900 SRM 51-10-02, ORIG THICK 0.045, IAW B737-900 SRM 53-30-15-0I-1. REMAINING THICKNESS/LOWEST READING 0.037, AT STA 460+10. REMOVED 0.008, FOUND TO BE OUT OF LIMITS IAW B737-900 SRM 53-30-15-1A-1 TOOLING ID: UT GAUGE: T8225M. REMOVED WEB IAW B737-900 SRM 51-40-02. LOCATED AND DRILLED WEB IAW B737-900 SRM 51-40-05 AND BAC DWG 143A8330-REV A. INSTALLED NUT PLATES ON WEB IAW B737-900 SRM 51-40-02, AND BAC DWG 143A8330-REV A. INSTALLED WEB IAW B737-900 SRM 51-40-02 AND BAC DWG 143A8330 REV A.REMOVED DOT: C786.