I know the filter caps do on the underneath of the chassis, but what about out of these guys...it looks like most of them are original, so i think i've got to replace a lot of them. My guess is the two black caps that are on the middle right of the board, the two black caps that are on the middle left of the board, also the red/brown one that's next to the two black caps on the left side of the board, and also the one all by itself in the bottom right hand of the picture. Is that correct? *Also, is there anything else you think i should do? I've got new tubes and a new 3 prong. Everything else is probably ok then?