What was found
PREVIOUS TO DEPARTURE, ENGINE NR 2 GENERATOR PLACED ON MEL AND APU WAS USED FOR GENERATOR POWER. DURING CRUISE FLIGHT, THE APU LOW OIL LIGHT ILLUMINATED AND SHORTLY THERE AFTER, THE APU AUTO SHUTDOWN. CAPTAIN DECLARED AN EMERGENCY AND DIVERTED TO FAR. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL SERVICED APU WITH OIL, GROUND RUN AND LEAK CHECKED, NO LEAK NOTICED.