What was found
MCN - DURING C20 CHECK DISCOVERED CORROSION ON THE AFT CARGO DOOR CUTOUT, AFT, FRAME EDGE COVER AT BS 851, FROM WL 158 TO WL 164 AND FROM BL 22R TO BL 25R. NO CORROSION REMOVAL LIMITS WERE FOUND IN THE BOEING 737-300 SRM. MAINTENANCE FABRICATED NEW REVEAL STRIP IAW BOEING 737-300 SRM 51-40-05-0G FIG 3, 51-30-01-0G FIGURE 7 AND BOEING DWG 65-56655. INSTALLED FABRICATED REPAIR PARTS AT BS 851, FROM WL 158 TO WL 164 AND FROM BL 22R TO BL 25R FOR THE AFT CARGO DOOR CUTOUT FRAME EDGE COVER IAW BOEING 737-300 SRM 51-40-02-0G FIGURES 3, 4, 6, 7 AND 8.