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 WING F5 FLAP TORQUE TUBE SPLINE CORRODED. MAINTENANCE REMOVED AND REPLACED THE LEFT WING F5 FLAP TORQUE TUBE IAW EMB 170 AMM 27-51-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.