Vintage Synth Repair

The "S" version I find is quite different.  Problem with all upper G's
and one B not triggering brass envelope remains.  Otherwise these seem
to be working great.  I get triggers on the blue wires just fine and
swapping cards does now change the key that is having the problem. 
Solder good underneath.  Hmm. Connections look ok. Schemos would be
great. -Bob