I just got another email from Powermaster stating that they will put all new internals into my existing case. They are covering it even though I am 6 months out of warranty. I just need to pay for shipping.
I am surprised that they are gutting it completely if they found nothing wrong. But, I am happy that they are replacing the unit. Hopefully this will fix my fluctuating ammeter/system voltage at idle.

Thanks again for the replies.