What was found
FLT 4409 - BNA - PILOT REPORT AT 17,000 FEET DURING CRUISE THE RT ENIGNE SHUT ITSELF DOWN WITH NO WARNINGS. AIRCRAFT RETURNED TO BNA AND LANDED WITHOUT INCIDENT. AN INSPECTION OF THE RT FUEL SYSTEM REVEALED THAT THERE WAS NO CONTAMINATION. THE FUEL LINE FROM THE BOOST PUMP TO THE ISOLATION VALVE WAS FOUND TO BE PARTIALLY COLLAPSED. AS A PRECAUTION THE FUEL SHUT OFF AND ISOLATION VALVES WERE ALSO CHANGED. (Z)