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