Qantas Jet returns to airport after take-off

Qantas Airways B767-336 (ER) VH-ZXE msn 24343 departed 09.13hrs for Sydney as flight 'QF642' and returned to the airport soon after take-off experiencing an undercarriage problem. The aircraft vented approx 600 kilos of fuel for an acceptable landing weight, and landed at 09.30hrs on RWY24  proceeding back to the terminal.  VH-ZXE eventually departed off RWY03 at 10.47hrs without incident heading to Sydney (YSSY).  Hexcode: 7C81D0