I bought Lisa 2/5 a couple of weeks ago, in battery damaged and non-working condition. Came with a Profile and a Lisa keyboard but no mouse, unfortunately. Will have to get the original Lisa mouse at some stage.
Not surprisingly, the I/O board and the motherboard have quite a bit of battery leak damage, inflicted over 40 yrs. I started with restoring the I/O board first.
I soaked the damaged area with diluted vinegar (50/50 water/vinegar) for about 30 mins and brushed with toothbrush. It somewhat helped but there was still a lot of green corrosion left over so I started with the fibreglass pen to remove the remainder. Quickly I realised there was too much corrosion to deal with a fibreglass pen, so I used a craft knife to gently scrape the big chunk of the corrosion off and then used the fibreglass pen. Many traces around the battery were completely corroded away.
I also had to remove some components to check the traces under them. It was rather difficult to remove the chips as the old corroded solder just didn't want to melt. I am glad I did though, as the traces under one of the chips also have been corroded away. This is going to be a bodge wire fix nightmare.
Luckily the back of the board is not as bad as the front.
One thing I am puzzled about is, when I scraped away the solder mask to expose the traces that look damaged, I was expecting to see copper, but they were dull tin coloured. And when I tried tinning them, the solder doesn't seem to stick even if I use plenty of flux. Is it usual to see tin coloured traces?