Cool that you got yours back. Hook it up!
I spoke with a customer service rep today and he walked me through the "unplug, replug, etc." that obviously didn't work. He seemed nice enough, but it made me a bit nervous that he got numbers I gave him wrong, three times, when trying to tell him my address and phone number.
I was nervous he'd give me a problem because my 360 was a launch date console, but after going through all the troubleshooting, he just told me that since this was my first replacement it was covered by MS.
He didn't tell me anything about my faceplate other than make sure I put my original on, in case I'd swapped it out with a custom one.
I went out today and bought a core system so I can at least play games and watch some movies while I wait. I'm guessing I won't get the box until the end of this week, and then I won't get the refurb back for another.
I bought some compressed air and blew it into my non-working 360 and a massive puff of lint came out, but unfortunately it still is giving me the 3 red lights. Oh, and my original also has something loose in it. Dare you to pop open that case and investigate!