I replaced a few more button switches tonight.
The arpeggiator is working. (however I have the below mentioned issue still)
I still have issues. I tuned the 6th oscillator (trim 10 and 11). It seems fine. However when I add the octave lower (or second octave) it seems to push the 6th oscillator higher an octave. Arpeggiator also sends the 6th oscillator an octave higher.
The other issue I have is when I play a low note then a high note I get a ghosting (like an extra pitch with pulsing) for a few hits of the high note. If I continue to repeat hitting the high note, the ghosting (for want of a better word) disappears and the pitch becomes clean. This can happen on any oscillator.
The same happens in reverse: hit a high key then a low key, the same ghosting occurs for a while.
I will clean up the key bed on the weekend as I'm working with about 60 percent of my keys.
Thanks again. I will fire up the oscilloscope again over the weekend