My band is looking to ass an amp for our subs. We can pick up a used Crest LT1500 for $500. It has a new main board installed by authorized Crest techs. Just wondering if this is a good deal for one. Opinions?? I know BassNW has one for less. But this one has been fixed and looked over. I also hear their is an "arching" problem with the LT series. This is supposedly why this amp was repaired. Fact or fiction.