No a new one wont work without a re-load software , why not fit it yourself and tow it in for the software?
You wont swap the circuit boards inside , they are bonded to the alloy heatsink . Long gone are the days of soldered connections and PCB's they are high tech welded wires and connected to each other with wire so fine you cant see it and then its all encased in a jelly substance ...
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 My comments are only based on my opinions and vast experience .
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