What was found
PDIS 944 79-01 0275 22FEB23 RSW OPEN U IN FLIGHT AT FL390 NOTICED R ENG OIL PRESS DISCREET LIGHT FLICKERING. ON EICAS NOTICED OIL QUANTITY 0, ALL OTHER ENGINE INDICATIONS APPEARED NORMAL. FOLLOWED QRH WHICH DIRECTED US TO REDUCE THROTTLE AND EVENTUALLY SHUT DOWN RIGHT ENGINE. DECLARED EMERGENCY, DIVERTED, LANDED IN RSW. ***EMERGENCY DECLARED*** ENG IS APPROVED FOR REMOVAL OPS CHECK GOOD, LEAK CHECK GOOD, OK FOR SERVICE