iiyama - part II 
I called iiyama today to ask for the monitor status. They replied, they won't change the monitor back, so I will keep the replacement device. This seems to turn out quite good and better than I expected.
But to prevent my mood to be bright, the garage guys told me, that they have not located the problem I turned the car in for (air condition ventilation motor does not work as expected). So I will turn it in again tomorrow for ongoing inspections. BTW: The warranty expired 13 days ago…