How to tell if a Tram has had work?

[husker]

I was going through one of my 201A's tonight and I never noticed, but the entire power section has had the Caps replaced, the B/A brd re-built and some other resisters look to have been replaced. The radio works very well, alittle weak on the receive compared to my other 201A but still works. How can I tell if it has had work???

But it also has the black tuner. I did find a brd with a silver tuner in the parts I have..is it easy to replace?

Also what is the bedst way to cleanout the volume control (static) do I remove it completely and clean it or can I spray in where it sits?

thanks for all the help guys!!!