I bought a used Bryston 3B-SST on the 'gon and it had a problem with it making a thump noise thru the speakers a few seconds after being turned off. Called the US service number, went thru a bit of troubleshooting with the tech, and he told me it was probably a problem with the muting circuit and to send it in. While they did not offer to pay my shipping cost, they did send the fixed amp back in a new box (the original was pretty beat up.) Service like this makes buying used Bryston gear a no-brainer, though you do have to make sure you get the original bill of sale from the seller now. My SST was old enough that this was not necessary.
http://www.bryston.com/pages/warranty.html
http://www.bryston.com/pages/warranty.html