Years ago, I had a US Duo which eventually stopped outputting redbook audio. I later got a Duo-R and have been using that as my main machine.
I was finally going to to have the capacitors in the US Duo replaced so I could sell it, but when I hooked it up and tested it last night, everything seemed to work fine. I know it wasn't working before, so is it possible a capacitor somewhere was only mostly dead and came back to life?