What was found
MX-STL- DURING MAINTENANCE CHECK FOUND CORROSION AT STRINGER SPLICES 21R, 20R, 19R AND 17R BETWEEN FUSELAGE FRAMES 28D AND 29. MAINTENANCE REMOVED CORROSION AND TREATED STRINGER SPLICES 21R, 20R, 19R AND 17R BETWEEN FUSELAGE FRAMES 28D AND 29 IAW ATR 72 SRM.