As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND CORROSION ON THE FWD CARGO CUTOUT LOWER SILL DOME NUT PLATES. MX REMOVED AND REPLACED NUT PLATE ASSEMBLIES IAW EMB 170 SRM 51-41-02 P/N 170-91835-401. A/C REMAINS IN CMH FOR HEAVY CHECK COMPLETION.