As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT: RIGHT ENGINE SPOOLED BACK OVER A PERIOD OF ABOUT 5 MINUTES. ABOUT 3 INCH SPLIT IN THRUST LEVERS TO SYNC N1'S. ADVISED BY MAINTENANCE CONTROL TO SWITCH OFF ELC ON NR 2 ENGINE. APPEARED TO RETURN TO NORMAL. PRECAUTIONARY LANDING MADE. TROUBLESHOOTING IN PROGRESS AT THIS TIME. REMOVED AND REPLACED ALTITUDE SWITCH, RIGHT ENGINE, AS PER M/M 75-32-07. AIRBORNE SYSTEM TEST OF EEC AND ENG LIMITER CONDUCTED AS PER M/M 71-00-00, ALL SYSTEMS CHECK GOOD. AIRCRAFT RELEASED FOR RETURN TO SERVICE