Loud, rapid clicking noise from fan
I'm on about my 15th hour of printing with my new MK3 and now there is a very loud, fast clicking sound coming from one of the fans. It has been clicking when running at a low speed previously (just when starting up/slowing down) but now the clicking is almost constant and very loud. I don't see any debris inside the fan which could be causing this. My MK3 came pre-assembled, I did not attach the fan myself. EDIT* I initially suspected the brown extruder cooling fan but after watching closely while a new print was started it is definitely the black print cooling blower fan.
I've tried to record a video to demonstrate the sound but the mic on my phone is bad, it doesn't pick up how obnoxiously loud it is but you can hear the clicking nonetheless if your volume is turned up (there's some mic popping at the beginning). Hopefully sharing a google drive video link works https://drive.google.com/file/d/1bVVvk7XP1S2laUUD-gnD4Ny1eLKKYKnS/view?usp=sharing
The only time I've heard clicking like this is from a faulty CPU cooling fan on my PC that had to be replaced.
Any advice is appreciated.