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Hi ,my name Jack
I will try to assist you the best i can through this medium.
Not a fast typist (but a fully qualified tech. though) so please be patient with my response time or very possible typos
Due to uncontrollable circumstance i will have to opt out
You don`t have to do anything , your question will be reposted for other techs. to see and jump in.
I see that no one came forward so I will step back in
About that DIODE (not a transistor ) , there is absolutely no data available for that , no schematic , no parts available and your only hope would be to read the numbers on it and then look at suppliers like Digikey for a replacement.
These boards were not made to be repaired .
By the way , as a side note , the prefix D next to a component on a circuit board always indicates a diode .