That's odd because my old MBP had the same issue and I had also replaced the drive with an SSD. I was fully prepared to put the original hardware back in, but the Apple tech diagnosed and fixed the video issue without any comment on my changes.
I've had a battery that was 10 cycles out of warranty and OS X started throwing up scary warnings but nope, it's out of warranty. A charger that just up and died, they did replace it but not after a 20 questions interrogation. When it's a clear problem they've been friendly, but the repair still takes a week since they don't have the parts or expertise in-store.
And I'm super-friendly to support staff - back in the days when I used Palm and Sony Ericsson gear, the would repair user-fault stuff for me no questions asked.
I've heard similar things from others in the EU. And all the love stories I hear are from the US.
Now you get this bizarre interrogation thing from them. You need to be really firm/aggressive or you'll be stuck there for an hour going through the various scenarios that you device has gotten wet. ("I am running late, get your GM and we can chat about why a failed iMac DIMM has nothing to do with water.")