LOUD BUZZING Coming from fan?

Anyone else run into this?

I am trying to figure out if I need to replace the fan unit or there is another fix I can employ.

When I power up there is a strong buzzing noise that sounds like the fan is contacting something. It is mostly on start up but comes and goes.

I opened it up and cleaned out the chassis of anything that had been sucked in over the past year or so but while I managed to find some debris it didn’t help.

Any shared experience or thoughts would be most appreciated. Especially if they avoided having to replace the part.

I do have a video but apparently can only upload photos to the forums. If anyone wants to hear it I can share elsewhere.