Well, my replacement finally arrived. As I mentioned before, it's from the 603 series so I had high hopes that I would get a nice unit this time. Unfortunately, while the light does seem whiter (and yay, no glowing specks this time), there seems to be this big green bruise right behind the text.
I got this replacement because of restarting problems with the old Kindle. When Amazon sent me a replacement, they told me not to bother sending the defective one back. I did a reset and kept reading on the old PW and the problem hasn't returned yet so far so now I have two PW's.
Uploading pictures of both here. The 501 PW has a very pink/reddish hue (with bits of green near the middle left) while the 603 is mostly green/white with a pinkish cast near the top. Can't say which I prefer although at this point, I would be hesitant to contact Amazon about yet another replacement. If they would let me send the defective ones back, I might, but seeing as how they are letting me keep the defective one, I don't want them thinking I'm abusing their generosity and risk getting my account banned in the process.
I've already deregistered the 501 (and have no plans of re-registering since it might already be a blacklisted unit at this point). I'll be using the 603 for a while to see if the green blob is not as bothersome as it seems but right now, I actually think the 501 has a more even light despite the pink tones.