As long as she is running OK, don't over think it. It will drive you crazy and you will spend more than it is worth to fix something that is really not a problem.
Remember that you have a machine that is 40 years old, she has done a lot of work and does not have all of the "new" technology behind it, so a little smoke won't kill anyone.
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"If I can't fix it, I can screw it up so bad no one else can either"
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