Quoted from StratDoc:Yes, tp5 registers correctly.
and this comment --
I have voltage a c23 and c24. Nothing on the other side of q20. It is a brand new transistor and continuity checks out okay and it does not test that is is shorted to the heat sink.
These both suggest 12V coming into board but not getting to Q20. No voltage on either side of Q20 --> broken trace or no connection to Vin pin of Q20.
I believe this is where Mk1Mod0 was going with posts #64 - 66.