Sintratec sometime answer really slowly. I think it is an resource problem a lot of start up company have. If i think it take to much time to play the question and answer game with a ticket system i call Sintratec...
On the other side perhaps you got an secondary problem with your first electronic board. I have made the experience with the ir-sensor. It was not working correctly and makes o lot of trouble. If a had an electronic failure every time the ir-sensor was killed too. But for me it was very important to known me printer was working fine exept the measured temperature. Yeah and now my printer printing again.