What was found
MCN - DURING C18 CHECK DISCOVERED CORROSION ON THE LT INBOARD MID-FLAP, OUTBOARD CARRIAGE, OUTBOARD FORE FLAP SEQUENCE CARRIAGE TRACK. NO CORROSION REMOVAL LIMITS ARE AVAILABLE. MAINTENANCE REMOVED AND REPLACED THE LT INBOARD MID-FLAP, OUTBOARD CARRIAGE, OUTBOARD FORE FLAP TRACK IAW BOEING SOPM 20-50-01.