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 DOUBLER AFT OF RIGHT SEAT TRACK EXTENSION FRAME 89 CORRODED. MAINTENANCE REMOVED AND REPLACED THE RIGHT SEAT TRACK EXTENSION DOUBLER FRAME 89 IAW EMB 175 SRM 51-43-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.