What was found
ON CLIMBOUT OF BUY, PILOT NOTICED RIGHT ENGINE STARTED RUNNING ROUGH AND NOTICED DROP IN MANIFOLD PRESSURE. PILOT NOTIFIED TOWER AND PROCEEDED TO RETURN BACK AND LAND SAFELY AT BUY WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REPLACED RIGHT ENGINE TURBO CHARGER, RUN UP AND OPERATIONAL CHECK NORMAL, NO FURTHER DEFECTS NOTED.