So I may have found the source of the issue...
Q912,Q911,Q93,Q92,Q96,Q97 all seem to be happy campers.... Emitter = 0.5V Base = 1.2V Collector =12V
... this seems to be all very uniform and on spec from what I have read.
Q90 however seems to have taken one for the team.... Collector = 12V Base = 0.34V Emitter = 0.02V... it seems poorly....
R82 = 100ohms R83 = 2.2 ohms (looks ok)
R81 = 188 ohms R80 = 25 ohms (looks dodgy especially as R81 is supposed to be 1K)
Not sure what has went on here but it looks like I need to change these resistor and Q90.
