What was found
AIRCRAFT WAS GROUNDED: AT 38,000 FEET, RIGHT ENGINE OIL QUANTITY BEGAN RAPIDLY FALLING.OBSERVED SLOW INCREASE IN OIL TEMPERATURE AND FLUCTUATION IN OIL PRESSURE, ECAM "ENG #2 1 OF 2 OIL LO PR" DISPLAYED. CREW REDUCED ENGINE TO IDLE THEN SHUTDOWN ENGINE IN FLIGHT. OIL QUANTITY DECREASED TO ZERO AFTER SHUT-DOWN OF #2 ENGINE. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO SFO WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND OIL ALL OF THE #2 ENGINE AND THE UPPER B NUT ON THE OIL TRANSMITTER LOOSE. TIGHTENED B NUT ON OIL TRANSMITTER, SERVICED ENGINE OIL TO FULL AND RAN ENGINE AT GROUND IDLE FOE 5 MINUTES. NO LEAK NOTED PER AMM 79-33-15.