Naxos41, pick up the phone and call Sonus faber directly in Italy and explain your situation.I have done so on three different occasions and each time Sf fixed the problem - no questions asked.I don't live in the US and had purchased from an authorised dealer in my country, but he and the distributor were so slow in making an effort to sort out my problem(s) I got frustrated and made the calls.It was a while ago when Franko Serblin was still there.In one of the instances the CEO at the time, Cesare Bevalaqua attended to the problem himself as he was the one who picked up the phone.Once we got past the language barrier they couldn't have been more helpful.
Good luck.
Good luck.