I finally had time today to repair an Amiga 3000!
Battery leakage had caused the pins/solder in the through holes to turn into a weird substance that wouldn't melt with the iron. I had to drill out every battery compromised hole.
After drilling out all the holes, I used a fiberglass tipped pen to scrub all the corrosion off the copper layer. A lot had gotten under the solder mask, so I had to scrape it away. I also had to repair two traces near U480. When it was all clean and with no sign of corrosion left, I tinned it all with solder.
Finally, I covered the bare metal bits with new solder mask. I wish I would have went with a transparent version. The shiny tinned copper looked way better than the green slime. But hey, it's a good protective coating.
I placed new sockets for the Paula and Denise, and new sockets for the 74 series logic. Also replaced a smattering of capacitors and resistors that had been eaten away. For the ferrite bead at FB485, I used a 60 Ohm 50 MHz part. I was unable to find the exact specifications of the original Commodore part.