Try gently working the connections on the motherboard of the top box. Also try removing and reinstalling the ram 4 or 5 times, the sockets also corrode that should help. Post a picture of the daughter card of the top box (need to see the whole board). That board on Ebay actually has a bios two chip installed but I need to see the daughter card because some are different. Also you may have to replace the HD to use the bios 2. I still think the 239s may work if you can get the ram to work. I have many that still work with bulging caps. Try the ram chip reinstall a few times. It was working I can't believe it went bad. The only time I replaced the motherboard is when there are no signs of life.
Rich
This is why they are called Real Touchy.