You can probably get a service manual from Levinson. They are very prompt in responding. Go to:
http://www.marklevinson.com/support/support-form.asp
Or phone: 781-280-0300
and ask to speak to a service tech.
http://www.marklevinson.com/support/support-form.asp
Or phone: 781-280-0300
and ask to speak to a service tech.