rogue dronus magnum issues

I have purchased a rogue audio magnm that has played beautifully up till now, it's now dead. wont' even power up! I am going to contact Rogue. but I bought it second hand so I have no warranty. There is a potted squard section in the middle of the amp where 4 wires come in and are terminated. One of the 4 wires is burned insulation with exposed wires. I suspect this is the problem. How it happened I have no idea, I am running Martin Logan Aeris i's which are a difficult load but I would have assumed this would knock out the output tubes if abything? Help!!