its all kind of built into the box, off the top of my head you have 2 clutch`s in the DSG, (same here) when was the last time you did an oil change on the gearbox, Try slipping it in manual and holding it in each gear or put in reverse, if that works ok then i would say the clutch is ok and you might find that one ring has gone? either way, if something has sheered and its scraping about the whole box will be pretty screwed by now and it could risk a jam and all f up and you will need a new one i would imagine. Do you have warranty cover? Its the one flaw of the DSG.. its price.. good luck.. IF you are lucky, you might be able to get it picked up on a lorry and have the thing services and the box emptied and any bits might come out in the oil. let us know how you get on