As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT FL340 GOT ECAM ADV, ENG 1 OIL QUANTITY. STARTED FLIGHT WITH 18 QT. TOOK SEVERAL MINUTES FOR OIL QUANTITY TO GO TO ZERO. ALL OTHER ENGINE PARAMETERS NORMAL. SEVERAL MINUTES AFTER QUANTITY AT ZERO, OIL PRESSURE DECREASED SLOWLY TO ZERO. AROUND 10 PSI WE GOT ECAM TO SHUT ENGINE DOWN. WE PERFORMED ECAM AND SHUT ENGINE 1 DOWN. DECESION MADE TO RETURN TO SAT. EMERGENCY DECLARED LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED #1 ENGINE IAW JOB CARD 26T40071001.