It helps to have owned one...

Battery is located at the top of the board - you can see the white place battery here outline and has one end of the dangling white wire connected to it. So the battery leaked and affected all the components underneath it. Whilst you can't see any on the legs of the big white chip there will be plenty hiding in the socket for that white chip. Then under there for the rest of the board you can see green legs on the chips plus a few other places look very green.

Like the bottom right through hole connection on the earthing plane about where the number 5 ought to be (look at the numbering across the bottom of the board).