At one time I was involved with electronics repair and from my experience I can tell you that warranties can very from one manufacturer to another. If your device is still covered by a warranty and you see a label or seal over a screw that must be broken in order to remove a cover double check with the manufacturer before breaking the seal.
Fuses and confusion
I am slowly upgrading my system and I am looking at the changing of fuses step. I have the following in my system: Sunfire TGA-7401, Marantz AV8805, Carver Load Invariant amplifier, Marantz Ruby, and a Vault 2i. My questions are 1). Which of these components have\use fuses 2). Does changing the fuses invalidate the warranty? 3). Are there videos on changing the videos or do you just pop the hood and start looking. Please feel free to point out issues that I am not aware of and whether this is even relevant under my circumstances. Thanks in advance.