What was found
CABIN PRESSURE EXCESS CAB ALTITUDE DISPLAYED ON ECAM PROCEDURE WAS MADE ACCORDING TO OEB 61. PERFORMED GENERAL VISUAL INSPECTION ON AVIONICS VENTILATION DUCTS AND WERE FOUND 3 DUCTS WITH CRACK BTW LATERAL AVIONICS COMPARTMENT RH AND AFT AVIONICS COMPARTMENT. REMOVED THE AVIONICS EQUIPMENT BLOWING AND EXTRACTION DUCTS 3 E/A IAW AMM 21-26-42-000-002-A. WAS INSPECTED DUCT AND THE DAMAGE AREA IS MORE THAN 30% OF THE DUCT SURFACE IAW DFPRM TASK 51-12-00-350-839-A01. THE REPAIR IS NOT POSSIBLE. WERE REPLACED THE AVIONICS EQUIPMENT BLOWING AND EXTRACTION DUCTS 3 E/A IAW AMM 21-26-42-400-002-A. EXTRACT FAN WAS REPLACED. PERFORMED PRESSURIZATION TEST FOR AIR LEAKAGE IAW AMM 05-53-00-780-002-A TEST PASS OK