Pioneer UE22


I have a problem with my reciver. And I need help. 

I bought a pioneer vsx lx55 reciver used about 1 month ago and it had the code UE22 within on the screen, but it worked perfect. After some time I had to heat it up with a blow dryer to get sound and now it still turns on but I don’t get sound.

Is ther any way to fix this my self?
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