Thanks,B-string,they advised me that,three resistors were bad. And they are replacing all of the resistors,and couple hours labor. They have had it for over 6weeks? They said they were running behind,due to one of their technicians,being off sick. They are a small facility here in Dayton,Ohio. When I dropped it off to them,they said it would be a two week turn around. I talked to Gallien Krueger,and they said there were 3 different boards,that could be used on the 800RB. GK,sent them the wrong fuseholder. Looks like I will have over $300 invested in the repair? Sorry for being lengthy. Frustrated.