You would have to clean if off to get a better view of the traces. A replacement diode is not expensive, you will
Even if the traces are gone there still exist the possible to jump a diode to the correct placement and get it fixed if you are doing this yourself.
The cost of having a technician do the job will jump over the price and worth of a new board.
It is hard to see but it appears the trace burned up to the white border of the Fan box silk screen.