From the view of the electronic components in the radio, it had not been rebuilt or restored. The physical appearance was very nice and all the tubes were new. So it is not worth troubleshooting a radio in that condition. The standard approach is to replace all the paper capacitors and the electrolytics, then troubleshoot the radio. However that wasn't necessary because it worked properly after the capacitor replacement. I think there was a failure of the power supply related to the electrolytic capacitors.
