About 12 years ago I had the capacitors replaced in my Cary Sli-80 F1 tube integrated at AudioConnection in the University District in Seattle after a capacitor failed. I haven't done business with them since because I moved away but they are dealers for Cary, Rega, Rogue and other high-end gear and did a great job on my amp at a reasonable price.
http://www.audioconnectionseattle.com/index.php
http://www.audioconnectionseattle.com/index.php