What was found
COCKPIT ECS MUFFLER ASSY DEVELOPED CRACKS ON EACH END OF THE MUFFLER IN THE WELDED SEAMS AND ALONG THE SIDE OF THE MUFFLER IN THE BEND RADIUS. THE MUFFLER IS FABRICATED FROM ALUMINUM WITH DUCTS WELDED TO EACH END AND IS WRAPPED WITH INSULATION AND FIBERGLASS TAPE. THE MUFFLER IS INSTALLED FWD OF THE AFT BAGGAGE COMPARTMENT ON THE RT SIDE AND IS ACCESSED BY REMOVING THE BAGGAGE COMPARTMENT FWD PANEL. THIS AREA IS ACCESSED AT 300 HOUR INTERVALS TO REPLACE THE MAIN HYD FILTERS. CRACKS WERE DISCOVERED AT THIS TIME DUE TO LOOSE INSULATION IN THE AREA AROUND THE MUFFLER.