What was found
INFLIGHT AT FL390, ENG ANTI ICE ON W/WING HEAT, THE RT ENG VIBS WENT INTO THE YELLOW BAND, PERFORMED QRH PROCEDURES AND RETARDED RT THRUST LEVER, DESCENDED TO FL350 IN CLR W/NO ENG WING ANTI ICE, RE-ENGAGED A/T TO CONFIRM PROBLEM. LANDED UNEVENTFUL IN PTY. INSPECTION HAS BEEN PERFORMED IAW FIM 71-05-00 FIG 108 ON RT ENG FAULT DID NOT DUPLICATE ON GROUND. RUN UP BLOCK 1 AND 2 C/W. LEAK CHECKS PERFORMED, ENGINE OK FOR FLIGHT.