As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON CLIMB OUT AT ABOUT 4000 MSL RIGHT ENGINE N1 REDUCED TO IDLE ON ITS OWN. CYCLED THROTTLE WITH NOT CHANGE. AFTER LANDING ENGINE IDLE STAYED AT 30% N1 NO OTHER ABNORMAL INDICATIONS. MAINTENANCE REMOVED AND REPLACED EEC #2 ENG IAW JOB CARD 71-94-04, ALL TESTS PASSED.