:( Seems to be a lot of gearbox issues lately - perhaps added heat thins the oil further and protects things less.
Anyway.. a 2nd hand DSG box seem to be around £1k on the Bay... my Manual has died, those are about £300 --- I was looking at rebuilds but it seems to be an open can regarding what needs doing, mine has 155k, so a low mileage box over rebuild is probably wiser all things considered.
Good luck, hopefully you don't need a new box.