As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - FL 0017 - FLIGHT EN ROUTE PHL TO LAX WHEN CAPTAIN ADVISED OF POSSIBLE FUEL TOTALIZER/CALCULATED FUEL PROBLEM. FMC CAL + TOL DISAGREE BY 3,000 POUNDS. FUEL QUANTITY DECREASING IN LEFT TANK. ON FLY-BY, LAS CONFIRMED FUEL LEAKING FROM LEFT ENGINE. MAINTENANCE REPLACED LOW PRESSURE FUEL PUMP ON THE LEFT ENGINE. (X)