What was found
AFTER TAKEOFF, PILOT NOTED LT FUEL TANK QTY 1,000 LBS LESS THAN RT FUEL TANK QTY. PAX REPORTED POSSIBLE FLUID STREAKING FROM LT ENG PYLON. AN EMER WAS DECLARED & THE FLIGHT RETURNED TO FIELD. NO LEAKS NOTED AT THE GATE. ACFT WAS REMOVED FROM SERVICE. PERFORMED HIGH POWER ENG RUN IAW MM 71-00-00, TEST 5. NO LEAKS OR DISCREPANCY NOTED, FUEL PUMPS OPERATIONALLY CHECKED GOOD, NO FAULTS NOTED. REPLACED LT CTR FUEL BOOST PUMP.