Are there two components to that system ? Like amp and computer ?
I am going from memory... it seemed like it was hard to diagnose which was at fault sometimes.... so ************************ will let you ' borrow' them to see which works... as long as you send it back in good shape... if that is not the one which needs replaceing...
Everyone should have one of their paper catalogs anyway for the nice blown up line drawings of parts and the proper names...