As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, CREW NOTED BLEED AIR DUCT FAILURE WARNING. ACFT PERFORMED AN UNSCHEDULED LANDING. DETERMINED A BLEED AIR DUCT FAILED. ACFT SCHEDULED TO FERRY TO A MX STATION. AFTER TAKE-OFF FOR FERRY FLT, CREW DETECTED AN OIL ODOR WHEN THROTTLES ADVANCED & RETURND TO DEPARTURE AIRPORT. BLANKING PLATES WERE INSTALLED ON THE ENGINE TO PREVENT BLEED AIR PENETRATION INTO THE CABIN AND ACFT WAS FLOWN TO MX BASE. DAMAGED DUCT REPLACED.