MacBook Pro Making Strange Ticking Noise

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my macbook pro 3 years old now. believe 2011 model. past week has been making ticking noise. can hear here.

know area coming don't know part blame. can 100% is not optical drive, hard drive or fan (although can see image close both drive , fan)
[​img]
guidance appreciated


in advance.
 

looks speaker
 


Forums Macs Notebooks MacBook Pro


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