As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF WHILE POWER PUSHED UP TO STABILIZATION, THRUST ON ENG #3 AND #4 LAGGED AT 25-30% WHILE ENGINES #1 AND #2 CAME UP NORMALLY TO APPROXIMATELY 45% N1(<P>FOUND NO FAULT MAINTENANCE MESSAGE ON PLF OR EF. PERFORMED POWER ASSURANCE TEST AND FOUND THE RESULT IS SATISFACTORY PER AMM 71-00-00-720-802-G01.</P>)