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 SEAT TRACK AT FRAMES 84-85 CORRODED. MAINTENANCE REPAIRED THE LEFT CENTER SEAT TRACK AT FRAMES 84-85 IAW EMB ETD 2012-190-014485. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.