What was found
IN CRUISE FLIGHT, 2500 RPM, 35 HG, PILOT NOTED L/ENGINE LOST POWER. PILOT FEATHERED PROPELLER AND POWERED ENGINE. MAINT NOTED INTERCOOLER DUCT, PN 102-389003-3 LOOSE AT DUCT SERV CLAMP WAS LOOSE, DUCT WAS PARTIALLY DETACHED. REPLACED DUCT, RUNUP OK. (K)