What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE RIGHT SEAT TRACK EXTENSION. MAINTENANCE REMOVED AND REPLACED THE RIGHT SEAT TRACK EXTENSION IAW EMB 170/175 SRM 51-43-01, 51-42-01, 51-41-01 & 51-40-02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.