Scope Cleaning

All capacitors were removed with "twisting" method. I don't have hot tweezers to desolder large SMD capacitors and I'm afraid I would damage more pads if I used a single soldering iron. Almost all the traces left in place, I lifted just two pads which is not bad having almost hundred caps and all these leakages which could damage everything around.

After all capacitors were removed I had to clean all the acid residue. I found a lot of PCB cleaning stories. Seems that most popular way is to use Simple Green general purpose cleaner.
Simple Green + toothbrush + baking oven at about 150F made it virgin clean.

All capacitors are replaced with new low ESR leaded ones.

Before caps replacement

After all the caps are replaced. Still have Acquisition board fail...

Error log shows a mysterious error

I still have failed acquisition test, but scope seems to be working. 

Unfortunately I couldn't find where the problem can be. The only suspicious area is around U1602, where were a lot of corrosion. I replaced this opamp with a new one but could not find where one of the legs connected. Seems to be a broken trace. I would be happy to fix it but could not find where to connect it. Need to try to find out...

It  looked not very nice...

But I think I can live with non-calibrated scope.