For an 8k its just loosen some screws for the backplane and take care with disconnecting cables and the heavy load of the backplane.
But of coarse its not for everybody.
A dealer with some basic technical skills can do it.
On other models i have no experience ,-))


800v3/218/271/8k.2/5k5s smile /5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,