Audio problem

Mercedes » S-Class » 2006-2013
Problem Description

So a week ago my sound went out. Theres no sound at all displays "device not available" gps works 

I took it for diagnostics 2 positions came up as open 

Mechanic told me to replace the sattelite tuner 

I did bypass it with optic fiber loop cause i read that u can and still no sound 

I will attach the diagnostic results maybe u guys can help ! 1of2