1= someone did the change over, they do not come like that!
2= that space means the Varta battery has been removed, nothing for you to do there!
3= that Blue battery is actually a capacitor, nothing for you to be concerned with!
4= those extra chips are that, the SP chip is used in a S plus machine, not yours, the SS chip could be used in your machine for the game it was made for, not sure what kind of clear chip it is or where is would be used, need a number to determine that.
5= the numbers on the blue tape may be the number of the sound simm on the MML board,
Hope this helps
Jim