As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) LEFT CABIN COMPRESSOR AIR DUCT LOCATED BETWEEN THE SILENCER AND THE WING REAR SPAR P/N 8540-153-569 CRACKED AROUND THE FLANGE FOR APPROXIMATELY 85 PERCENT OF THE CIRCUMFERENCE. THE CRACK HAD PENETRATEDTHE FULL DEPTH OF THE FLANGE AND EXHIBITED DELAMINATION AND CORROSION OF THE FLANGE MATERIAL.