The only way I know of to get the motherboard revision is opening the Amiga and read the information from between the kickstart ROM's and the turbo board connector.
If you have never used a soldering iron or are not very good with it, it might be better to let AmigaKit take a look. They have a replacement capacitor service.
From my own personal experience I can only say that the SMD capacitors have reached their end. Certainly after what I saw this past weekend from my CD32 systems.