Can anyone help with Mark Levinson LNC-2 Setup

I have been using my LNC-2 in 2 way stereo mode with no problems. I want to configure it to operate in 3 way mono but cannot figure out how to do it. I have no manual and can't find one on line. Mine has only one internal switch (mono/stereo), photos sometimes show a second switch(HZ/normal). I need to know how many modules are used, what's input, output, ect... I have tried every combo I can think of with no luck. Can anyone help?