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Serial numbers do not identify boards nor connectors in the least. Please tell me the part #, or at least some description of the part in question.
Also be sure to tell me what the Model Number of your Strength Master treadmill is. Model series of StrengthMaster machines include
StrengthMaster parts are available from various sources... if you have a Used, or fairly old, treadmill model, or a model not listed above, then you may have to go with the Used Parts market, which is rather uncertain to yield good results.