I never worry about warranties. I've made no claims beyond infant failure.
BTW, it doesn't totally void the warranty. for the OEM not to honor the warranty thay need to say that what you did caused the problem. So if a knob breaks, it is in no way caused by the power supply. However, just about all the electronics are fed by the power supply so they can claim that your power supply did it. OTOH, good manufacturers might say "I know it wasn't the power supply" and honor a warranty claim anyway.
I've ugraded a lot of power supplies. I currently have 6 linear power supplies in my system (3 for DAVE, 1 for Upscaler, 1 for ROCK, 1 for newtwork switch).
if you want to order the parts and send to me I'd be glad to do the upgrade for you. This isn't an offer for everyone here, I just want to do one and see what I think of it.
Jerry