What was found
REF NON ROUTINE C075821. DURING DEN C4/S1 C-CHECK, INSP NOTED CORROSION ON THE FLOOR SUPPORT NUT PLATE HOLES LOCATED AT FRAMES 68 TO 69 AND STA -Y1292. MX REMOVED AND REPLACED THE FLOOR SUPPORT IAW SRM 51-42-11, SRM 51-44-11, AND SRM 51-23-11.