Inside the Mac mini
by Volker Weber
Take a good look at this gallery. Because the fine print says, that you need to turn the machine in if you want to add RAM, Bluetooth or WLAN. Do it yourself and potentially void the warranty.
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Apple “does not recommend” that users upgrade the memory themselves — you’re supposed to have a service provider do it if you want to add more after purchase — but doing it yourself does not void the warranty unless you damage something. A booth person told me the memory slot is easily accessible once you get the case open.
Hard drives, AirPort and BlueTooth seem to be different, though. Source: http://macintouch.com/mwsf2005notebook.html
More on what invalidates the warranty and what does not:
Clearing up confusion about the Mac mini