If you've already done the driver board side of the interconnector, I'd have a really close look at the cpu male side pins and clean these with some very fine wet and dry, used dry. I'd also examine the solder connections of the males under bright light with good magnificiation and maybe reflow them before total replacement - the males shouldn't be that troublesome. I'd also examine and swap if socketed the 5101 and 6810 memory chips that are just to the right of the rom chips.
