What was found
AFT WET AREA STA947 AFT L/H LAV INBD MOUNT STRUCTURE HAS CORROSION AFT WET AREA STA947 AFT L/H LAV INBD MOUNT STRUCTURE HAS CORROSION G335<[01] EVALUATED MOUNT STRUCTURE PER BOEING737-800 SRM 51-10-02 MOUNT STRUCTURE FOUND TO HAVE NO ED AT FASTENER HOLE WERE CORROSSION IS EVIDENT OF 50 PERCENT OF MATERIAL LOST REQUIRES TO BE REPLACED REMOVED MOUNT STRUCURE AND MOUNT AND INTERCOSTAL PER BOEING 737-800 SRM 51-40-02;[02] REMOVED AND REPLACED INTERCOSTAL PN: 147A5660U3 BN:461926 IAW B737-800 DWG: 147A5650 REV C; SRM 51-40-02;[03] VERIFIED ALL STEPS COMPLETE AND REMOVAL AND REPLACEMENT OF INTERCOSTAL PN: 147A5660U3 BN:461926 IAW B737-800 DWG: 147A5650 REV C; SRM 51-40-02