Hi Doug how do you know Brystonwill change you sometimes they will just fix the amp,you do need the box,and you will have to pay shipping one way.I would fix it if i were you it`s still a good amp,even if it did cost afew bucks in the end.I did the same thing with an old 4b afew weeks ago and they did it all for free,new power cord and fixed a hum cleaned it etc.