Fan question

I have another Orion amp here and the fan is very loud in it

Almost sounds like it’s grinding against something but it’s not .

Is there a way to fix this fan or anyone know of a good replacement I can buy and where ?
 

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Never thought that at all you we’re trying to push it on me .

I have wanted to buy it for awhile now and had to wait til I got a home computer

I wanna learn more about repairing amps not just replacing a few defective parts here and there .

Since I repair them I would like to learn how to test certain Things how they work ect I want and need to learn more about them since someday this site might not be here anymore hope that’s not the case