What was found
THE FLIGHT CREW REPORTED THE LEFT ENGINE ROLLED BACK 20 TO 25% AFTER THE INITIAL POWER REDUCTION BEFORE RELIGHTING. THIS OCCURRED AT THE YOP OF DECENT AROUND 36000 FT. THE FLIGHT CREW ALSO STATED THAT THE AIRCRAFT SHUTTERED DURING THIS EVENT. AFTER RELIGHT THE ENGINES IGNITION SYSTEM OPERATED FOR 2 SECONDS. THE MAINTENANCE BASE MAINTENANCE TEAM DETERMINED THAT A FUEL LINE COUPLING WAS LEAKING. THE FUEL LINE WAS REMOVED AND A NEW FUEL LINE WAS INSTALLED. OPERATIONAL CHECK FLIGHT WAS SATISFACTORY. THE AIRCRAFT WAS RETURNED TO SERVICE.