Neve V2 help

[mitsos]

Hi, I'm having trouble with a racked V2. Problem is in the Mic gain switch.  Line input works fine, but the mic switch only seems to work in the first 4 positions (-10, 0 , 10, 20).  Gain goes up with each of those positions (the gain trim also works fine), but the rest of the positions (30-40-50-60-70) do not change gain at all. Gain stays at the same level as in the +20 position.

I do hear the relay clicking between the +10 and +20 positions, if that makes a difference. 

Any help would be appreciated, the schematic I have does not show the mic gain switch. 

thanks in advance!