What was found
FWD CARGO DOOR CUTOUT; SILL PLATE HAS MULTIPLE AREAS OF CORROSION FROM STA 440 TO 492. REMOVED CORROSION IAW SRM 51-10-02; OUT OF LIMITS IAW SRM 53-30-15-1A-1. REMOVED LOWER SILL WEB IAW B737 SRM 51-40-02. VERIFIED NEW WEB AS P/N 143A8122-10 PER DWG NO 143A8120 REV:A. LOCATED AND DRILLED IAW BOEING DWG ENG. DWG. NO 143A8120 REV:A; COUNTERSANK HOLES IAW B737 SRM 51-40-08; INSTALLED NUT PLATES IAW B737 SRM 51-40-02-0G-0. INSTALLED WEB IAW BOEING ENG DWG. NO. 143A8120 REV:A AND B737 SRM 51-40-02. APPLIED CIC IAW B737 AMM 51-21-91-620-8. INSTALLED NUT PLATES IAW B737 SRM 51-40-02-0G-0. INSTALLED WEB IAW BOEING ENG DWG. NO. 143A8120 REV:A AND B737 SRM 51-40-02. APPLIED CIC IAW B737 AMM 51-21-91-620-802.