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Residue inside of heatsink

That looks burned and rough. It is likely to prevent the bowden tube from properly seating, and if that falls into the nozzle, it could clog it. That may be plastic that leaked between the hot end ...
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Residue inside of heatsink

I'm not sure what this gunk is, but it seems to be standard in Creality hotends and is presumably something they used to hold the threads or improve thermal properties or something. In any case it ...

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