What was found
LT 280 WEB CORRODED ON AFT SURFACE. LT 280 WEB REMOVED AND REPLACED PER SRM 51-42-06 AND 51-42-21. REMOVED LT LOWER WEB STRUCTURE AND STRAP IAW SRM 53-11-10 AND 51-42-06. LOCATED HOLES IN AFT FACE OF LOWER WEBS IAW SRM 51-42-06. FINISHED LOCATING HOLES IN LT LOWER WEB PER SRM 51-42-0. OK TO INSTALL. STARTED INSTALLING FASTENERS IN LT LOWER WEB PER SRM 53-11-10 AND 51-42-06. CONTINUED INSTALLING LT FASTENERS IN LT LOWER WEB PER SRM 53-11-10, 51-42-06, AND 51-42-13. FINISHED INSTALLING ALL FASTENERS IN LOWER LT FS 280 WEB PER SRM 53-11-10.