What was found
INTERGRANULAR CORROSION FOUND ON VERTICAL LEG OF SEAT TRACK STARTING AT LAST SEAT ADJUSTMENT PIN HOLE (APPROX 20.25 INCHES FROM MOST FORWARD HOLE). CORROSION STARTED AT AFT EDGE OF HOLE AND PROGRESSED AFT ONE INCH. SURFACE METAL ON RIGHT SIDE OF VERTICAL LEG WAS FOUND EXFOLIATING APPROXIMATELY 2.5 PERCENT OF TOTAL THICKNESS. POSSIBLE CAUSE IS EXPLAINED IN AC 43.13-1B, PAGES 6-17 AND 6-18, PROPER PERIODIC INSPECTIONS. (X)