What was found
AFT CARGO BS 1148 BETWEEN STR'S 28L AND 29L, AFT SIDE OF FRAME HAS CORROSION BELOW FAIL/SAFE CHORD. CORROSION BEYOND LIMITS PER B727 SRM 53-10-1 FIG 1. CUT OUT DAMAGED AREA 5" BY 1.5", FABRICATED REPAIR DOUBLER FROM 7075-T6, .071" BY 6" BY 4", PO NR 9004940, FILLER FROM 7075-T6, .063" BY 5" BY 2", PO NR 9004960, PER B727 SRM 53-10-4 FIG 13 AND 53-10-2 FIG 5. TREATED, PRIMED, AND INSTALLED REPAIR PARTS PER B727 SRM 51-10-2 AND 53-10-4 FIG 13.