What was found
FS 409+128, VERTICAL POSTS HAVE ONE EACH INDICATION .2" LONG BY 95% FSH ON THE BL 0.0 RT VERTICAL POST AFT RADIUS, RBL 18.0 OTBD VERTICAL POST .25" LONG BY 95% FSH AFT RADIUS, INBD VERTICAL POST .3" LONG BY 98% FSH AFT RADIUS. FAILED NDT INSPECTION. REINSTALLED OVERBOARD EXHAUST VLV IAW AMM 21-24-34-400-801. REMOVED INSULATION FROM AROUND FS 409+128 RBL 18. REINSTALLED INSULATION AT RBL 18 IAW AMM 25-81-02-400-801. REMOVED FS 409+128 RBL 18 POST ASSEMBLY. INSTALLED NEW SERVICEABLE POST ASSEMBLY IAW SRM 51-42-06, REO 601R-53-41-889. DRILL LOCATED NEW SERVICEABLE RBL 18 POST ASSEMBLY IAW SRM 51-42-06. OPERATIONS CHECK OF OVERBOARD EXHAUST VLV REQUIRED, REF TASK 21-24-34-710-801. OPERATIONS TESTED GOOD IAW AMM 21-24-34-710-801. DRILLED, LOCATED & INSTALLED NEW SERVICEABLE POST AT RBL 18 IAW SRM 51-42-06 & REO 601R-53-41-889. NO FURTHER ACTION REQUIRED.