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Good afternoon. You are correct to assume that you have a bad control board, but there are actually 2 control boards on this model dryer. The only one that can cause the issue where the display shows dashes when you select most modes is the interface control board which is the one behind all the buttons you're pressing. Unfortunately the interface control board will need to be ordered and replaced to resolve the issue so below is a link to the part.
CLICK HERE for interface control board
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