What was found
WHILE IN HVY MX CHECK - CORROSION ON THE AIRCRAFT ON THE AFT WING TO FUSELAGE ATTACH FLANGE. MARKED IN WHITE. REMOVED AND REPLACED RH AND LH AFT WING TO FUSELAGE ATTACH FLANGES REF SRM 51-23-04, 51-40-02, 51-40-08, 51-23-05, 51-23-06 P/N'S 170-92409-003 AND 170-92406-003