What was found
(CAN) SHORTLY AFTER DEPARTURE FROM ANU, THE CREW WAS ALERTED TO A LOW OIL WARNING. CAPTAIN NOTIFIED DISPATCH OF THE ALERT AND THE DECISION TO RETURN FOR MAINTENANCE. A PAN PAN PAN WAS DECLARED WITH ATC AND THE FLIGHT RETURNED. MOC AND SOC WERE ADVISED OF THE DIVERSION AND OF THE OVERWEIGHT LANDING CONDITION. RESOLUTION REPLACED NR 1 EIU PER AMM 73-25-34 PB401. DRY MOTORING CK. CARRIED OUT PER AMM 71-00-00-710--001-A TO CONFIRM OIL PRESSURE INDICATION.