Mark Levinson tech specs

Hi, need some help here guys, repairs on the Mark Levinson Model 27, just wondering if anybody knows the procedure for adjusting the 4 preset pots. and what is the correct idle current and how do I adjust the off-set voltage to zero.
You can probably get a service manual from Levinson. They are very prompt in responding. Go to:

Or phone: 781-280-0300
and ask to speak to a service tech.