you could try giving it a bleed for starters,make sure your master cyl. is well topped up,think this model takes its feed off the brake master cyl,if no better would probably try your clutch master cyl next,again bleed the system,and if no better afraid it is a g/box out job for a look at your slave cylinder,while you are there it is advisable to replace the whole clutch,good luck
wickham
September 2010