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Helpful answers
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Jul 11, 2015 1:49 AM in response to rointhestudyby dominic23,★HelpfulReset SMC. https://support.apple.com/en-us/HT201295
Choose the method for: “On Mac notebooks with non-removable battery”.
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Jul 11, 2015 4:28 AM in response to rointhestudyby OGELTHORPE,You might run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.
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Jul 14, 2015 6:28 PM in response to dominic23by rointhestudy,I think this solved it . . . After I did it nothing happened but later the noise was gone, came back briefly then went again . . . so I guess it's fixed now, thanks!