Rattling Noise From The Back Of My Ex490

I walked into my room and i heard a rattling noise. I put my ear on the server and the noise was coming from the back of the server. I turned off the server and waited a few and powered it back on. The noise came on instantly. After a while the noise went away and then came back.

Are there fans in the back of this server?
Could the fans be the issue if there is fans on the back?
Where can i get replacement fans?

Thanks in advanced

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EX490
CPU E6550
8TB HDD's
2GB RAM