I am wondering this question myself, if it is too expensive i'll just convert mine to a 1x12 cab. See a lot of line 6 amps failing, see them on clearance at pawn shops a lot as is. I don't see this type of failure rate in other amp manufactures. i think if a board is faulty they should replace it at no charge no matter the warranty status. I owned a used fender and those warranties are 5 years and are transferable. I don't mean to offend line 6 they seem like a good company but failure of these spider amps seems pretty common. I know it is off subject but microsoft covered xbox red ring of death 3 years after the warranty. Just saying if you have a common place problem like this it might be best to have people send them in or at least send them a free replacement board they can install or pay some one to.