marantz 11s2 sacd player modifications

has anyone had a marantz 11s2, 7s1 or other older marantz reference sacd player modified ? if so, how did the sound change ?

i will be getting a marantz 11s2 soon and am thinking about having a tube buffer stage installed, to "warm up" the sound. i am not aware of anyone who does this.

does anyone know of any modifiers who have done this in the past ?

thanks