What was found
APU SHUT DOWN IN CRUISE, ONE RESTART ATTEMPTED, FAULT LIGHT AGAIN. NOTE NR 2 GENERATOR WAS DISCONNECTED AT TAKEOFF FROM SFO FOR RIGHT GENERATOR DRIVE LIGHT ILLUMINATING. FOUND APU AUTO-SHUTDOWN FOR OVERSPEED PER FIM REPLACED ECU, CHECK OIL QTY AND APU AREA, ALL CHECKED GOOD. NR 2 GENERATOR FOUND LOW ON OIL, SERVICED TO FULL CHECKED FOR LEAKS NONE NOTED, RAN ENGINE FOR 20 MIN WITH FULL LOAD NO PROBLEMS, REINSPECTED FOR LEAKS NONE NOTED.