As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION AND GOUGE ON LT LOWER SEAT TRACK BEAM AT CF3, FR74 TO FR84. MAINTENANCE REMOVED AND REPLACED LT CF3 SEAT TRACK BEAM IAW EMB 170 SRM 51-43-01 AND SRM 51-43-02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.