I seem to have beaten the odds!
My ASUS motherboard died a few weeks ago, and my heart sank. In addition to =RoC= withdrawal, I knew I had to endure the sixth circle of hell that is ASUS Customer Support. I filled out all the requisite forms to send in my board to the service center, and prepared my eulogy when I would receive the inevitable news of a denied RMA.
The first glimmer of hope came in the form of a "Repair in Progress" status the day after my board arrived. I was still in denial, however. I just knew they were luring me in for the killl.
But hark! I received an email stating my repair was complete less than two weeks later. Now, neither the email nor the customer support representative I called had any information whatsoever about the board's root cause or repair steps taken. I was afraid they'd just send the board back as is, and claim it worked when they tested it.
I waited in anticipation for my baby to come home. When she finally arrived.... it wasn't my baby. The motherboard ASUS sent back was either a new board, or (more likely) a refurbished model.
Either way, my PC lives! No errors (knock on wood) since. The lack of any documentation still worries me, but I'll just count my lucky stars ASUS actually fixed my problem.