Your tech needs to go back to school. I would definitely not confer with him any longer for anything! Did he at least confirm there is a problem at all? Dc offset should be as close to 0(zero) as possible. 60mv is quite high. However if you're talking about bias adjustment, it may not be. You haven't been all that clear. Which is it? Either way, 12v is so excessive as to be damaging. What reading are you getting on the left channel?
