What was found
AFT PIT FLOORBEAM HAS CORROSION BEYOND LIMIT UNDER NUT PLATES AT FS 965, BL17L AND 19L. REMOVED AND REPLACED FLOORBEAM AND 2 Z-ANGLES IAW DC9 SRM 51-10-3, 51-10-4, 51-30-2, 51-30-5 AND 53-11-3. REINSTALLED, RIGGED AND OPS CHECKED STAB TRIM CABLES AND ENGINE TR CABLES IAW DC9 MM 27-40-0 AND 78-00. OPS CHECKED GOOD.