Burnt connector

[CosimoScalese]

Geeetech A30. The temperature fluctuates by + or - 7 degrees and sometimes drops a lot until the extruder stops. I found that the connector that connects the cables to the electronic board located above the hotend has a burnt pin, in particular the negative pole of the heating cartridge. Could this actually be the cause of the fluctuating temperatures? What to do? Is it possible to have spare parts for replacement? Thanks