XC60 XC90 D5 2012 - "engine system service required" message

Hi there, I wonder if anyone can help with this message that has appeared. I have read that some people have said it is to do with the engine oil being overfilled. I had the vehicle served a couple of months back and haven't touched the oil since. How can the error message be identified, can this be done at any mechanic shop? I'd rather not go to the expense of taking it to a dealer but will if it it necessary.
Thanks in advance.


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