What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND CORROSION ON SHEAR PLATE AT FRAME 87 AFT GALLEY. MAINTENANCE REMOVED AND REPLACED SHEAR PLATE AT FRAME 87 AFT GALLEY IAW EMB 170 SRM 51-42-02, 51-20-00, 51-23-06, AND 51-23-05. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.