What was found
ON OUR DESCENT OUT OF FL390 WHILE DECREASING POWER, GOT A VIBRATION OUT OF RT ENG, FOLLOWED BY RT ENG ROLLING BACK. SHORTLY AFTER, RECEIVED AN ENG SHUTDOWN R CYAN MESSAGE. AFTER ABOUT 5 - 10 SECS, RT ENGINE STARTED RELIGHTING ITSELF, & STABILIZED TO NORMAL SETTINGS. AFTERWARDS, ENG WAS RESPONDING & RUNNING NORMAL. QRH PROCEDURE COMPLETED, & EVENT MARKER PUSHED. REMOVED RT ENG & INSTALLED SERVICEABLE ENGINE. PERFORMED ALL REQUIRED FOLLOW ON CHECKS WITH ENGINE WITH IN EMM PARAMETERS, NO LEAKS NOTED. MAINTENANCE ACCOMPLISHED IAW AMM 71-00-30 AND EMM 71-00-00. ORIGINAL SUBMISSION DATE: 8-17-2026.