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Anytime i see a burnt / over heating R51 pretty much know the HV section transistors are shorted. Pretty good tell you can pick up at a glance.
too bad 2n3440 goes EBC otherwise it would be safer / easier to use soemthing like MJE3439 or TIP50. Put one of those small TO-220 heat sinks on Q23 but it would be flapping around. I guess you could drill a hole or do some kind of fold over mounting to the right.
Maybe Q22/Q23 failed because because the bux85 collector was floating? Not sure....
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