As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE DUCT WAS RECEIVED WITH ONE FLANGE RUPTURED AT A PREVIOUS WELD REPAIR LOCATION. ALL OTHER HIDDEN DAMAGE INSPECTION TO THE DUCT ASSEMBLY DID NOT REVEAL ANY SUBSEQUENT DAMAGE AS A RESULT OF THE DUCT FAILURE. WELD WAS AT A RADIUS OF THE FLANGE IN AN AREA NOT NORMALLY REPAIRABLE.