As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE SLOW TO SPOOL WHEN POWER PUSHED UP ON TAKEOFF AND IN THE AIR. SLOW ENOUGH TO YAW AIRCRAFT IN THE AIR. ONCE CAUGHT UP ALL PARAMETERS APPEAR NORMAL + MATCH RIGHT ENGINE. REMOVED AND REPLACED LH ENG FUEL FLOW GOVERNOR REF B757 AMM 73-21-01. PERFORMED POWER PLANT TESTS 1, 2, 9, 10 AND 11 NO LEAKS NOTED. ALL TESTS OPS CHECK GOOD NO DEFECTS NOTED AT THIS TIME. A/C OK FOR SERVICE. REF T3F18E0044MNC AND T3F18E0044MQP FOR RII.