As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INTIAL CLIMB RT ENGINE ENCOUNTERED POWER SURGES. PILOT DECLARED EMERGENCY AND RETURNED TO ANC. DURING RETURN PILOT DISCOVERED RT SPEED LEVER HAD MOVED AFT FROM TAKEOFF POSITION. MAINTENANCE CHANGED FRICTION LOCK DISCS ON RT SPEED LEVER AND GROUND RUN ENGINE NORMAL.