What was found
AFT CARGO COMPARTMENT BETWEEN STA 787+7.50" AND 847 WL 156.4 RBL 28 TO RBL 20 CARGO DOOR LOWER CUTOUT; TRESHOLD WEB IS CORRODED IN SEVERAL AREAS TOP SKIN AS MARKED AFT CARGO COMPARTMENT, REMOVED CORROSION ON THRESHOLD WEB. IAW SRM 51-10-02-0G-0, VERIFIED MATERIAL LOSS, LOSS OF .035", REMAINING .015, ORIGINAL T .050, OUT OF LIMITS, IAW SRM 53-60-15-1A1, TOOL AAR=29271 DUE 04/03/20, REMOVED AND REPLACED THRESHOLD WEB, IAW SRM 51-40-02-0G-0 . AND BOEING DWG 146A8340, APPLIED CORROSION INHIBITING COMPOUND IAW AMM 51-21-91-620-802 P/N 146A8123-25 ATAG WN8886