What was found
MX-STL- DURING MAINTENANCE CHECK FOUND CORROSION BETWEEN FUSELAGE FRAMES 30 AND 31 AT STRINGERS 21R, 20R, 19R AND 18R. MAINTENANCE REMOVED CORROSION AT STRINGERS 21R, 20R, 19R AND 18R BETWEEN FUSELAGE FRAMES 30 AND 31 IAW ATR72 SRM. STRINGER 21R P/N-S53571602214, STRINGER 20R P/N-S53571602212, STRINGER 19R/18R-S53571602202.