What was found
CREW REPORTED THAT BLEED VALVE 1 CLOSED, APPEARED AFTER TAKEOFF, AND PACK 1 CLOSED AFTER RESETTING BLEED 1. CLOSED AGAIN FOLLOWED QRH, TRIED USING APU TO RUN PACK 1, AND RECEIVED A SMOKE ODOR AND A LOUD SOUND FROM FOROM THE PACK. ACFT LANDED WITHOUT INCIDENT. MX INSPECTED THE ACFT AND FOUND A BLOWN DUCT ON THE TORQUE MOTOR DUAL VALVE. MX INSTALLED DUCT, OPS AND LEAK CHECKED WITH NO DEFECTS, ACFT APPROVED FOR RETURN TO SERVICE.