I have a Dyson DC39 that I have enjoyed using for the last few years but recently I have noticed a strange sound after I push the power button after vacuuming as the motor spins down. It's a mix of grinding and whining. a few uses after I heard the noise I smelled a burning smell. Thinking it was some hair caught in the brush-bar, I cleaned that out but the smell still persisted after use. I disassembled the vacuum and noticed that there is a fine dark residue on the inside of the motor housing and inside of the HEPA filter (I have attached pictures) and my question is, is my motor going out or do I just need new carbon motor brushes?
Thanks for any help you all can provide.