Punch 800.2 repair

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I have a punch 800.2 that fried on me. I opened it up and there was a burned transistor. I also have a punch 351M and it is not working too well either. I want to know if I can take the transistors from the 351M and put them on the 800.2. I am not a eletronics guru so I need some help in this area.
 
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