What was found
UPPER CARGO AFT WALL FLOOR DRAIN STRUCTURE BELOW FLOOR PANELS BS 1605 , S88L-S88R HAS CORROSION ON UPPER SURFACE. REMOVED DRAIN AND DRAIN LINES AT STA 1605, REMOVED LT AFT WALL. R & R LT AND RT OTBD FLOOR BRACES AT STA 1580 TO 1605, PICKED UP FLOOR PANEL HOLES IN OTBD FLOOR BRACES REINSTALLED AFT WALL, AND DRAIN AND DRAIN LINES. IAW SRA 51-40-02.53-00-51, 51-40-05 AND AMM 51-41-00. CORRODED LEVEL 2, PN: ANGLE SEC 46 FLOOR PANEL 368-53-16-94490-201 AND LOC: 1580 TO 1605 20R TO 20L. ACFT WAS GROUNDED.