What was found
WHILE ACFT IN HEAVY CHECK MAINT FOUND CORROSION STRUCTURAL CENTER FUSELAGE III WET AREA LH CENTER GUSSET PLATE FRAME 90,REMOVED CENTER FUSELAGE III WET AREA 53-23 LH CENTER GUSSET PLATE FRAME 90 REF: EMB SRM 51-40-08. INSTALLED NEW CENTER FUSELAGE III WET AREA 53-23 LH CENTER GUSSET PLATE FRAME 90. REF: EMB SRM 51-21-01, SRM 51-40-08, APPLIED SURFACE PROTECTION TO CENTER FUSELAGE III WET AREA 53-23 LH CENTER GUSSET PLATE FRAME 90. REF: EMB SRM 51-23-05, SRM 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.