It's done. It's cured. It has arrived. My wife is again with me.
It actually returned two weeks ago from servicing.
So, just ending up the case: what was the problem? Their depiction was short and desultory, but sufficient at the same time: some module on motherboard responsible for communication was damaged. As I intended and asked in direct letter to rather repair the malfunction over sending me brand new instrument, they had to replace the whole heart - the motherboard, which had to be imported from Germany while I live in Poland. That highly expanded the repairment time, in addition to this dedicated for searching for the source of defect, which was for sure not quite obvious...
