What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON THE LT WING UPPER SKIN. PERFORMED REWORK REPAIR ON AREA OF CORROSION 4A WING TOP SURFACE RIB 1+18" STR 6 IAW RAS 6213321 TD/80452321/005/2018#A,REWORK ARE REQ REINSP AT 40,500 FC OR 81,100 FH WHICHEVER OCCURS FIRST FROM EMBODIMENT IAW RDAS 80452321/003/2018 CAT B. SUPPLEMENTAL INFORMATION TO FOLLOW.