What was found
AFT CARGO BAY DOOR SILL PLATE HAS CORROSION AT 10 EACH SCREW HOLES (MARKED) / REMOVED CORROSION IAW B737 SRM 53-60-15-1A-1; FOUND TO BE OUT OF LIMITS IAW SRM53-60-15-1A-1. REMOVED DAMAGED SILL WEB IAW B737 SRM51-40-02. IDENTIFIED NEW WEB AS P/N 146A8123-25 PER BOEING ENG. DWG146A8120 REV:E. LOCATED AND DRILLED IAW B737 SRM 51-40-05; COUNTER SANK HOLES IAW B737 SRM 51-40-08. TREATED AND PRIMED HOLES IAW 737 AMM51-21-41 AND AMM 51-21-72. INSTALLED LOWER SILL WEB IAW B737-SRM51-40-02 AND BOEING ENG DWG NO 146A8340 REV:A. APPLIED CIC IAW B737 AMM 51-21-91-620-802.