probably an over voltage or spike, be sure to check all the other components are in good nick as i have often found when something goes pop like this there is something else in line that is causing the fault.
Everything else seams ok,the relay beside of it was burt but I chipped of the plastic and it looks fine inside but I might take it to an electronics expert to check it out just to be shore.
Thanks again.
If it's blown clear of the board you will have to check the integrity of the tracks on the other side of the board. Unfortunately these days there is a tendency for electronics manufacturers to use multi layer boards, so the tracks could be out of reach between the layers.