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@fraksken I suggest you check the crimp connection between the fan wires and the connector, in case the problem is a bad crimp or a broken wire.
Yes that's definitely a burnt out driver chip.
If you are using a single extruder you can map the spare extruder driver instead.
Instead of M584 X0 Y1 Z2 E3 it would be M584 X0 Y1 Z2 E4
And add M569 P4 S0 and set S0 or S1 to match the correct direction of the extruder.