What was found
(CAN) ON CLIMB OUT THROUGH 1000 FT AGL. A LOAD WOOF SOUND WAS HEARD BY THE CREW WITH AN INCREASE IN TORQUE INDICATION. THE CREW DECIDED TO SHUTDOWN THE ENGINE AND RETURN FOR LANDING. LANDING WAS UNEVENTFUL AND THE ACFT WAS TOWED TO THE HANGER. ENGINE WAS INSPECTED EXTERNALLY AND NO PROBLEMS WHERE FOUND. MX CREW STARTED THE ENGINE AND THE ENGINE OPERATED NORMALLY. FURTHER INVESTIGATION IS ONGOING AND BLEED VALVE IS THE SUSPECT PROBLEM.