As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE FOUND FWD FUSELAGE FLOOR STRUCTURE CORROSION AT LT INBOARD SEAT TRACK BETWEEN FR 12-20. FWD FUSELAGE FLOOR STRUCTURE AT LT INBOARD SEAT TRACK BETWEEN FR 12-20 REMOVED AND REPLACED, IAW EMB 170 SRM 51-41-01 AND 51-43-03. A/C REMAINS IN CHECK.