What was found
(CAN) DURING CRUISE FLIGHT, RT ENGINE LOST POWER. PILOT ELECTED TO RETURN TO AIRPORT OF DEPARTURE (WINDSOR AIRPORT). PILOT CONDUCTED A POST FLIGHT RUN UP AND ONLY ACHIEVED 33 IN MAP. THE INTAKE, TURBO CHARGER AND TURBO CONTROL SYSTEM WAS INSPECTED FOR OBVIOUS DEFECTS. THE BELLOWS (COUPLER) ATTACHING THE `J` TUBE TO THE AIR BOX WAS FOUND UNCOUPLED. THE COUPLER WAS REATTACHED. THE ENGINE WAS GROUND RUN AND MAX MANIFOLD PRESSURE WAS OBTAINED (42 IN).