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Doesn't look burnt to me.
We use denatured alcohol to clean circuit boards, but any mild cleaner might work OK.
Most often on these type of things you are not getting a good connection on the spring connectors to the circuit board (the small silver squares in pic#4).
You could also do a continuity check on the diodes.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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