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 CENTER FLOORBEAM TRACK AT FRAME 18 CORRODED. MAINTENANCE REMOVED AND REPLACED THE LEFT CENTER FLOORBEAM TRACK AT FRAME 18 IAW EMB 175 SRM 51-43-01, 51-41-00, AND 51-43-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.