I am glad I reached out to this community before I fooled around with my PP.
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The tech has submitted a ticket to replace my ¡°break board¡± (brake board?). Apparently he thinks that is the issue.
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Mariusz suggested I listen to the buzz after stopping the blade. I did so, and the buzz persisted for 14 seconds. Perhaps that lends credence to the brake board being an issue.
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Again, thanks to everyone for the help!
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John Hinman
Boise ID
Kappa 450X and A941