I read your posting recently and would like to share some good news. I purchased a home built the same year as yours. I have the same model ST 1000 with the same problem you have. I found a recall on Nutone's web site describing this problem and explains that this problem is caused by short on the the circuit board next to the volume control. I took my unit apart and discovered I had the problem the recall was describing. I called Nutone and they sent a rep out to my home to pickup my unit. Nutone repair my unit at no charge. Thanks: Jerry

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