What was found
DURING HEAVY CHECK MAINTENANCE FOUND CORROSION, AFT FUSELAGE INTERNAL SHEAR CLIP AT FRAME 84 STRINGER 28R. REMOVED AND REPLACED AFT FUSELAGE INTERNAL SHEAR CLIP AT FRAME 84 STRINGER 28R PER SRM 51-40-08. APPLIED SURFACE PROTECTIOIN TO RIVETS PER SRM 51-23-05, 51-23-06. A/C REMAINS IN CHECK.