As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THRUST INSTABILITY EVENT NR 1 ENGINE 3500' IN CLIMB NR 1 ENGINE N1 STARTED FLUCTUATING +2 -5. THRUST LEVER MOVED TO MAINTAIN N1 AM WAS RESPONSIVE. EVENT LISTED APPROXIMATELY 2 MINUTES. FLUCTUATIONS WERE RHYTHMIC AND MINOR. AFTER ENGINE STABILIZED A/T RE-ENGAGED. R & R HMU IAW MM.