that's just what I found techknight - all the pins from the rom holder are all blackened and the solder is a dark grey...rotton.On 3 pins it was almost completely gone. I resoldered those. All the via's around the battery are all dark grey and 'flakey'

is there any way to renew the solder in a via and make it good again?

Ive tried pressing soldering tip into each via, small amount of force, and turn clockwise and anti clockwise. Sometimes it forces shiny solder to the surface.....sometimes it does not. Don't know if it is making things worse.

I imagine the only fix is to meter every connection and then bridge any broken ones.........that would take allot of time and still might not work.

is solder  in this condition destroyed , as in non conductive. Fresh new solder will not melt into it, even with flux. It does not want to stick to copper or anything.

Is there any other alternative. There must be a way to remove this bad solder and replace it with new solder

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thoes dam batteries have allot to answer for!!