Welcome to the forum. That would bother me as well.

It looks like you are carefully looking at the right things, and have checked them. I don’t know much about how to use the IR sensor readings, whether your readings are normal or not. The readings don’t appear to show overheating, but I’m not certain of that. I don’t have any more to add.

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Marshall Welch
Seattle, WA
1982 300D-T