Burned Mosfet component due hidden short

Hello all, I bought faulty box with explanation from customer that it is not working.
Box was never opened before and with valid warranty seal.
As soon as I opened it I did not see any visible demage. As soon as I put the plug into the outlet the box smoked and even caught some fire around sata connectors.
I measured PSU and it is not shorted but PSU board connector is shorted.I removed components from demaged part but it is still shorted and I need some advice how to get forward woth this especially with burned part.
Can you provide a picture from working unit how to connect Mosfet (Q5C1) as my part is demaged.