Mac Pro 2013 - Fan not working. Found that the interposer cable between the fan/wifi part and the i/o board was burnt. Traced back to the reverse of the i/o board (the connector in the picture is the i/o interposer connector) and can see a burnt component. I'm suspecting its a resistor but no idea. Other side of the cap is not shorted, connector is not shorted. Just wondering if anyone knows ?