What was found
(CAN) AFTER TAKEOFF #1 ENGINE TORQUE STARTED TO CLIMB EXCEEDING 130 PERCENT. POWER RETARDED AND TORQUED FLUCTUATED FROM 40-100 PERCENT. ENGINE SELECTED TO MANUAL AND TORQUE DECREASED BUT DID NOT CEASE. AIRCRAFT RETURNED TO BASE. POST FLIGHT INSPECTION FOUND ENGINE NH WOULD JUMP TO 44 PERCENT WHEN A START WAS ATTEMPTED AND THE PT SHAFT WOULD NOT ROTATE WHEN THE STARTER WAS SPINNING. SUSPECT TOWER SHAFT OR TORQUE SHAFT SHEARED OR DAMAGED. ENGINE REPLACED. STRIP REPORT TO FOLLOW.