You will not get a discount - but you may as well ask, just in case it's owned by a fund who wants out.
They might tell you that the loan is unsustainable but what can they do? If they start legal action, you would have the loan well paid off by the time they get near the courts.
Just write to them and tell them that you will pay the loan off over the next 6 years. However, if they would accept a settlement of €80k, you may be able to borrow it from family.
They will just let it go on and might give you a call or two.