thx all!
we don't have original apple stores here, but there's autorized resellers and service. I'd like to get the 1TB EVO SSD when it comes down a bit in price and replace the 1TB 5400rpm snail in my 2012 imac...
authorized service said they'll do it, i only need to pay the labor costs, warranty will remain valid. much better than trying to open this slim piece of engineering myself....so i was thinking of getting apple care just in case, ideally before going to the service guys.