What was found
DURING HEAVY CHECK MAINTENANCE FOUND SIGNS OF CORROSION BETWEEN APU SILENCER SKIN AND TAIL CONE AT 6 O'CLOCK POSITION. CORRODED FITTING BETWEEN APU SILENCER SKIN AND TAIL CONE AT 6 O'CLOCK POSITION REMOVED AND REPLACED IAW EMB 170 SRM 51-41-01, 51-42-01 AND 51-43-02.