What was found
DURING T/O FROM UIO STATION, SHOWED "L GEN DRIVE LIGHT " AND MSG "L GEN OFF". PERFORMED LIST. APU STARTED AND OPERATED NORMAL, AND LH GEN DICONNECTED. FLIGHT CONTINUED AND THEN NOTED STATUS MSG APU OIL QTY (ADD). 10 MINUTES LATER, APU FAILED SHOWING EICAS MSG "APU OFF". DUE TO ONLY HAVE THE RH ENG GEN OPERATING, THE CREW HAD TO DIVERT TO PTY. A/C HAD A SOFT LANDING WITH 4.9 TONS APPROX OVERWEIGHT. REMOVED AND REPLACED LEFT IDG GEN TASK CARD AMM 24-11-00-715-005 OPS OK, RAN ENGINE POS ON GROUND OK, NO LEAKS P/N OFF 766088B S/N OFF AAAR0Y0808 P/N 739515C S/N ON F0201. REMOVED AND REPLACED APU GEN TASK 24-21-01-024-001/002 S/N ON 0710, S/N OFF 0630 P/N OFF 7278108, P/N ON 727810C ACCOMPLISHED OPS SYSTEM TEST PER AMM 24-21-00-735-008.