Livestrong 10.0T Motor (Johnson 2.75HP) whistling noise

I have a 10 year old 10.0T Livestrong Treadmill with a Johnson 2.75 HP Continuous Duty motor, which has recently been making a consistent whistling sound. I opened it up, disconnected the front roller to remove the drive belt, and confirmed that manually spinning the flywheel makes this sound. There were also some black shavings around the flywheel. I'm wondering if I should investigate further, or is my motor done? I've tried to google this and haven't found an answer. Even pointing me in the right direction would be greatly appreciated.



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