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I have an old furnace that is not working properly, a Carrier model 58SE150-3 series 314 from 1975.

I have diagnosed the problem to a likely fused fan blower relay. In looking over some of the other forum posts people seem to recommend that I not replace the relay directly (a Potter and Brumfield KU-5399). Instead, the advice seems to be do replace the entire circuit board.

So, first off, is it true that replacing the entire circuit board would be the recommended approach? And if so, where can I go to find a replacement board? This is obviously an old model, and I have had trouble locating a site that sells a replacement board
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