What was found
WHILE ACFT IN HEAVY CHECK MAINT FOUND CORROSION STRUCTURAL CENTER FUSELAGE III WET AREA RH INTERCOSTAL JUST AFT OF RH GUSSET PLATE FRAME 90,REMOVED CENTER FUSELAGE III WET AREA RH INTERCOSTAL JUST AFT OF RH GUSSET PLATE FRAME 90, DRILLED UP NEW INTERCOSTAL AND PREPPED FOR INSTALLATION REF: EMB SRM 51-23-04,51-40-02,51-40-08. COMPLETED INSTALLATION OF NEW CENTER FUSELAGE III,APPLIED SURFACE PROTECTION TO CENTER FUSELAGE III WET. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.