What was found
DURING BC-4 CHECK, EXFOLIATION CORROSION WAS FOUND ON AFT BULK CARGO DOOR SILL BEAM Y1500 RT, BETWEEN FS 60 AND FS 62. MAINTENANCE CUTOUT DAMAGED AREAS OF AFT BULK CARGO DOOR SILL BEAM Y1500 RT AT FS 60, FS 61, AND FS 62; FABRICATED 3 EACH FILLERS AND DOUBLERS; INSTALLED REPAIR PARTS IAW ER 26-5341-04278-RC1.