As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE SURGED ABOUT 5 PERCENT N1 SHORTLY AFTER TAKEOFF (TO APPROX 100%) WHILE THE THRUST LEVER WAS IN MCT THEN RETURNED TO NORMAL. POWER WAS BROUGHT BACK TO MCR AND THE LT ENGINE N1 BUG STARTED TO FLUCTUATE FROM 95% TO 92%. LT ENGINE N1 NEEDLE AND RT ENGINE N1 NEEDLE BUGS WERE STEADY AT 95%. LT BUG EVENTUALLY STOPPED FLUCTUATING AFTER A COUPLE MINUTES, FLIGHT CONTINUED NORMALLY.