What was found
FS 409+128 VERTICAL POST HAS ONE INDICATION .3"" LONG BY 90% FSH ON THE BL 0.0 LT VERTICAL POST AFT RADIUS. FAILED NDT INSPECTION. REMOVED Y DUCT & UNDER FLOOR AC DUCT BY REMOVING 3 EA ADEL CLAMP, 3 EA WORM CLAMP. REINSTALLED Y DUCT & UNDER FLOOR AC DUCT BY REINSTALLING 3 EA ADEL CLAMPS, 3 EA WORM CLAMPS IAW SRM 51-41-04. REMOVED INSULATION FROM AROUND FS 409+128, BL 0. REINSTALLED INSULATION AT FS 409+128 BL 0 IAW AMM 25-81-02-400-801. REMOVED FS 409+128, BL 0 POST ASSEMBLY IAW SRM 51-42-06 & 51-42-21. OK TO INSTALL. INSTALLED NEW SERVICEABLE BL 0 POST ASSEMBLY IAW SRM 51-42-06 REO 601R-53-41-889. DRILL & LOCATED NEW SERVICEABLE BL 0 POST ASSEMBLY IAW SRM 51-42-06 & 51-42-21. PERFORMED A MAJOR REPAIR TO FS 409+128 VERTICAL POST BL 0 IAW SRM 51-42-06 & REO 601R-53-41-889.