As I had to inspect the link head , I unscrewed the related nozzle (as done several times in the past, without any problem) .However, after re-installing the nozzle and having started the printer up, a warning saying "Tool 0 failure" appears and the printer becomes unusable. I checked all contacts and a blue cable on the left heating head came out easily from its receptacle (while the one related to the the right head seems firm in place).I suspect this cable being the temperature probe.Could...