What was found
***CORROSION*** NUT PLATE STRIP LOWER SURFACE; COMMON TO STRAP OF ACB LOWER SURROUND STRUCTURE. BS840-847; RBL21 / CORROSION DAMAGE ON NUT PLATE STRIP LOWER SURFACE; COMMON TO STRAP OF ACB LOWER SURROUND STRUCTURE; BS840-847; RBL21 FOUND TO BE OUT OF LIMITS IAW SRM 53-60-15. NO ALLOWABLE DAMAGE GIVEN; REPAIR BY REPLACEMENT IAW SRM 51-10-02. REMOVED DAMAGED PART AND INSTALLED A NEW NUT PLATE STRAP ASSY. ALL WORK ACCOMPLISHED IAW SRM 51-40-02 AND DWG 146A8340 SH12; REVC