As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN HEAVY CHECK, LEVEL TWO CORROSION WAS FOUND ON LT SEAT TRACK EXTENSION AT FR 19. MAINTENANCE REQUESTED EMBRAER ENGINEERING SUPPORT AND RECEIVED ETD 2010/170-00708 FOR REPAIR. MAINTENANCE REPAIRED AC PER ETD AND IS STILL OUT OF SERVICE DUE TO THE HEAVY CHECK.