Hello, good morning!
We have the same problem in Hungary with the Linea PB 2AV.
The red ring lights on both groups had turned off and that the boiler temperature has risen to 97 degrees. The normal temperature is 92,5 degrees. We changed everything, wire, solid state relay, probe everything and nothings happened. And then we look inside and we saw there is a hole on the heater. And now is working. 
Your machine is working now?
Have a great day