What was found
INTERNAL SKIN AFT OF BS 280 BETWEEN STR 19L - 20L CORRODED. REMOVED, FABRICATED NEW REPLACEMENT SEALING DOUBLER, AND INSTALLED THE NEW DOUBLER IAW DWG BA670-31051, REV NC, DWG BA670-31057, REV -L AND SRM 51-42-06-001-001-A01. CHECKED GOOD.