What was found
(CAN) CUSTOMER REPORTED A LOSS OF THRUST CONTROL: ON ROUTE, APPROXIMATELY 15 MINUTES AFTER DEPARTURE, THE FLIGHT CREW NOTICED RH FADEC FAIL EICAS MSG AND A SUBSEQUENT ROLL BACK TO IDLE OF THE RH ENGINE. THE CREW DISCONNECTED THE AUTO THROTTLE AND MANUALLY ADVANCED THE THROTTLE LEVERS. THE ENGINE FOLLOWED THE COMMAND. A FEW MINUTES LATER THE ENGINE ROLLED BACK TO IDLE A SECOND TIME, WITH THE CREW BEING ABLE TO MANUALLY RECOVER THE ENGINE RESPONSE. THE RH FADEC FAIL EICAS MSG EXTINGUISHED, BUT 5 MINUTES PRIOR TO LANDING, THE RH FADEC FAIL EICAS MSG RE-APPEARED FOR 1 MINUTE AND CLEARED AGAIN. THE A/C LANDED AS SCHEDULED. (TC# 20190405009)