What was found
FS 280 CROSSBEAM HAS CORROSION ON UPPER FLANGE. [SUP 05-24-07] REMOVED CROSSBEAM FROM FS 280. BEGAN LOCATING RT CROSSBEAM SPLICE PN CC670-34175-7 IAW REO670-53-11-047. LOCATED LT AND RT SECTION AND GABLE FLOORBEAM FS 280 PN CC670-34175-7, IAW BOMBARDIER REO 670-53-11-047. OK TO INSTALL LT SERVICEABLE FLOORBEAM SECTION. OK TO INSTALL RT SERVICEABLE FLOORBEAM SECTION. STARTED INSTALLING LT BS 280 CROSSBEAM IAW REO 670-53-11-047. INSTALLED ALL REQUIRED FASTENERS. LT & RT BS 280 CROSSBEAM SECTION IAW REO 670-53-11-047. OK TO PRIME, LOCATED AND DRILLED NUTPLATE HOLES FOR FLOORBOARDS IAW SRM 51-40-11. INSTALLED NUTPLATES NAS1870-3-3 PO 10001 IAW SRM 51-42-15.