[Boatanchors] KLM multi 2700 - sub auduble tone addition question

[Greg Mijal]

Hi:
I've putting some older VHF gear back in order lately.  Last week was a Clegg Thor 6.  This week it's a KLM multi 2700 all mode 2m/10m rig.  I want to add a subaudible tone board to the discriminator but don't know exactly where to wire it to without a schematic.  Can anyone point me in the right direction on the PCB?
Tnx
Greg
WA7LYO
Kinston NC