As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING ENGINE ACCELERATION TEST , ENGINE FAILED TO RESPOND TO THROTTLE MOVEMENT AND HUNG AT 56.4 PERCENT N1.CREW DECLARED AN EMERGENCY AND DIVERTED BACK TO TOL. AIRCRAFT LANDED UNEVENTFULLY. FUEL CONTROL WAS REPLACED AND AIRCRAFT RETURNED TO SERVICE.