Mine was under warranty too but I went ahead with opening it for SSD, Ram change and repasting.
If you are careful then aren't you safe and not voiding the warranty?
Well , it's not that I haven't opened my lappy in the past . Technically , I have voided it's warrant already by opening it's for cleaning, but I have not tampered the seal ( Yes , I managed to open it without tampering the seal over the screws. Have devised a method for that.).
But the last time I opened , I did realize what a PITA it can be to dismantle it and bring it all back together. Mine , is not such an easy one top open and pack them back. If something goes wrong , I just don't want them to find it out. )
And right now , I am not gaming too much. ( Stressed from office work. ) , so the laptop barely surfaces anything above 75C even if it is powered on 24x7.