i edited your quote for what i was going to answer. Hope thats ok. It looks like you should be able to get a replacement. But heres what happened to me
Well... In early january. i got a new pair of really really expensive in ear monitors. JH 13's if any of you know what those are. I plugged them into my laptop because i didn't have an external sound card at the time. I then noticed that my laptop sound card makes this evil hissing noise, with the headphones, i then tested it and it makes it through anything that is plugged into it. (not just the new headphones) I had never noticed since i always use optical out. So i sent it to apple.
The first time, they replaced:
Logic Board
Left In/out
GPU (they said it would fail if they didn't replace it)
Harddrive
some other random stuff, a fan as well i believe
4 days after i got it back, it started doing that again, and it wouldn't reformat the new hard drive or burn cds, so off it went to apple. They replaced:
Logic board
GPU (they once again told me it was an affected unit...)
superdrive
left in/out
harddrive
So i got the computer back, and the 2nd new hard drive clicks like crazy, and the sound is still terrible. lol. So i called and told them i had lost faith in my computer surviving, if after 4 days they had to replace over $1000 in computer parts (if i had to pay for it), how was this computer supposed to last me my last year of college. yada yada yada. so they told me to call and ship it back to them when i finish my semester of college, (i couldn't give up my laptop at the time), and they would send me a replacement.