What was found
DURING C-4 CHECK INSPECTION, FOUND LEFT HORIZONTAL STABILIZER LEADING EDGE AT STA XFS185 CORRODED. REPAIRED CORROSION DAMAGE IAW SKETCH AIA/E/2404 AND EA 96-326 AND 8110-3. C-4 CHECK WORK CARD NR 4001 1OF1, NON-ROUTINE TASK CARD NR 87530.