It looks like the sensor is leaking which is common just get a new sensor and O ring and replace them, this should fix the problem. It is difficult to see what you are talking about since there were no oil drips but that's what it looks like, if I am wrong please take more pics for me to look at.
Please let us know what you find so it will help others.
Best, Ken
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Friday, October 7th, 2016 AT 12:23 PM