As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT SHEAR PLATE AT FRAMES 87 AND 88 CORRODED. MAINTENANCE REMOVED AND REPLACED THE LEFT SHEAR PLATE AT FRAMES 87 AND 88 IAW EMB 170 51-40-02, 51-42-01, AND 51-43-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.