Well, there is for sure no way to un-melt it I was thinking about how to fix the problem.
The blue led was on, no problem with it. I read on some topic that the temperature can be wrong on the screen but the PLA was flowing normally (I mean a continuous flow but not really fast), my prints are quite accurate also and not totally melted. It doesn't sound like it's to hot
I'm sure the PEEK part melted, there are some bubbles on it. There's also some leakage from the PLA, i can see some silver but not that much.
Next step is to fix the problem, I'll try to get the temperature of any item and test the sensor on it but i don't have any clue about what to do if it turns to be ok.
PS: I'll send some pictures later on