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You seem to be an EXPERT as it pertains to the Watkins/Hotsprings tub and I was wondering if you might be able to answer a question. I recently found an original 71920 control board with the 14 pin connector, but it missing the Fiber Optic Aux cables which my current bad board has.. This probably means its a low voltage control head. In a previous posting you say that you can still use this board as a replacement, so my question is - what will not work since I can't plug in the three Fiber Optic Aux cables. I REALLY APPRECIATE ANY INSIGHT. THX AGAIN.