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Brako – R19 is crucial and while the color bands suggest the “39” portion of the value is correct, the other bands do not seem to indicate that it is a 390K Ω value. I suggest lifting one leg of R19 and double-checking that value for 390K Ω. If it is too low a value, it could throw off the voltages for Q4.

I also notice that some of solder points seem ‘starved’ of solder – perhaps reflowing & adding a touch more solder to some of those more lightly soldered points may be of benefit.