What was found
(CAN) DURING INVEST OF A PNEUMATIC LEAK AT LT A/C PACK DISCHARGE DUCT HEAT EXCHANGER CONNECTOR, FUEL VAPOR BARRIERS FOUND DAMAGED ABOVE THIS AREA. METAL FUEL VAPOR BARRIER HAD DAMAGE OF APPROX 2 SQ FT. FIBER FUEL VAPOR BARRIER PUNCTURED 2 SQ. IN. FUEL VAPOR BARRIER REPLACED & PNEUMATIC DUCT COUPLING ALSO REPLACED. FIBER FUEL VAPOR BARRIER REPAIRED IAW MM. A FLEET CAMPAIGN IN PROGRESS TO REPLACE ALL COUPLINGS IN A/C BAY AREA BUT ACRFT HAD NOT YET BEEN DONE. UNABLE TO DETERMINE IF FUEL VAPOR BARRIER DAMAGE CAUSED BY PNEUMATIC LEAK AT HEAT EXCHANGER COUPLING. A VISUAL INSPECT OF BARRIERS CARRIED OUT IN 08/04 DURING ROUTINE A-CHECK & NO FAULT NOTICED. AIRBUS CONTACTED & ASSIST REQUESTED IN EVAL OF FAILURE.