What was found
PILOT REPORTED THAT WHILE IN CRUISE FLIGHT THE LT ENGINE FUEL FLOW SUDDENLY DROPPED OFF AND THE ENGINE BEGAN TO RUN ROUGH AND LOSE POWER. THE BOOST PUMP WAS SELECTED TO HIGH AND MIXTURE INCREASED TO FULL RICH WHICH HAD LITTLE EFFECT. THE PILOT CONTACTED DISPATCH AND MAINTENANCE AND AFTER A SHORT DISCUSSION, MAINTENANCE RECOMMENDED THE ENGINE BE SHUTDOWN AND SECURED TO PREVENT THE POSSIBILITY OF FIRE. THE PILOT SHUT THE ENGINE DOWN AND MADE AN UNEVENTFUL LANDING. THE ENGINE WAS UNCOWLED AND IT WAS DISCOVERED THE UPPER DECK PRESSURE LINE HAD PULLED OUT OF IT'S FITTING AT THE LT AND RT JUNCTION TEE. THE LINE WAS REPAIRED AND GROUND RUNS REVEALED NO OTHER ABNORMALITIES.