What was found
MCN - MAJOR REPAIR - DURING C-17 CHECK EXFOLIATION CORROSION WAS FOUND ON LOWER SURFACE OF LT AFT OUTBOARD SHEAR WEB BETWEEN BS 996 AND BS 1005, LBL 39 TO LBL 42, WL 208. MAINTENANCE REMOVED CORRODED SHEAR WEB FROM BS 996 TO BS 1005, LBL 39 TO LBL 42; FABRICATED A NEW REPLACEMENT SHEAR WEB PER DWG 65-46812; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02 FIG 3, 4 & 8.