OK.
Yes, I'm in Toronto, though this issue only really developed here in TO and on vacation with my girlfriend in Vancouver. The temperatures in both places during the onset of my original screen retention were very high and I think worsened the issue.
I have an interesting story to go with this, actually.
Here goes.
Taking cues from the earlier post from Canuck1970, where he noted he went to an authorised repair centre, I stopped in to a local reseller / repair shop to see if they would be able to replace the screen with a Samsung model.
The first sales guy I spoke to was the same guy I had mentioned the issue to over the phone, and he was eager to see the defect in action. He signalled to his colleague that 'this was the guy I told you about, with the retina display image distortion'.
So I started to outline that I had bought the computer a couple of months earlier, that the original screen showed severe signs of image retention and the condition was only getting worse on the replacement.
DIGRESSION
He started to motion me over to the service department, when behind me and over to the right, these two young guys stood shoulder to shoulder by the display models, then grabbed three laptops between them, and bolted for the door.
The two clerks that were serving me started after them, yelling, 'Hey, stop, thief!', and they turned north out of the shop. A third dude standing just outside the shop watched calmly as they tore off in one direction, then strolled into the same counter where the first two guys were a minute before, looked over at me, still at the shop register, then decided he was going to go ahead and do it, and grabbed a fourth laptop, and bolted south. As I looked at him, I started rummaging around for the camera on my phone, and of course I couldn't get it started in time to get a shot of his face. But I did get three shots of him dashing off.
The second, older of the two clerks returned to the shop and I told him about the second theft with the third guy, told him about the photos, then he went to call the cops to report it. The one cop showed up a few minutes later, so he took our details and our statements, and I sent him a copy of the photos in email.
While we waited for the cops to show up, the clerks wanted me to speak with the service technician in the basement. He hadn't seen anything, so was pretty much in the dark - almost literally in this case. They told him about the theft.
END OF DIGRESSION
Anyway - we got into the retina image retention issue, and he explained that unfortunately none of the reseller / repair shop's technical staff were certified for the new retina displays, so he couldn't help me. But we talked about it and he wanted to check my serial number. Thinking back to Canuck's email, I asked if he could confirm how many parts he had listed for the retina display itself.
We pieced together that there was an original retina display screen, with one part number (661-6529), and now, there was another retina display screen, with a different part number, 661-7171 . No confirmation as to which is or was which.
After we gave our respective statements, I returned home.
I did some digging on the internet and found this:
http://www.iresq.com/macbook-repair/macbook-pro-with-retina-repair/macbook-pro-r etina-display-repair.html
-- which appears to be for the original screen, whichever that is. I think we can piece together which is which, but I don't have confirmation either way.
Hope this helps.
MS