2009 Audi chorus volume switch fault

[smokinjoe]

i have a blaupunkt audi chorus with intermittent volume problems,is it possible to change just 95128 to a used unit to overcome component protection or is there more involved with these units?

part no is 815 7 648 278 380
8T2 035 152 A BVX
AUZ1Z2H2876411

All info appreciated,

thanks.