The spark plug tube is pushed in to the head. Its an extremely tight interference fit but its really the only component which could allow oil to get in there.
Just disconnect the oil level sensor cable at the sensor on the left side of the sump. Its cable tied in a couple of places but not difficult to get to. You don't need to cut it to move it. I actually run that cable behind the belt cover when reassembling as its much neater and not in the way - there is plenty of space on that side.
The connector inside the right hand cover is for the cam position sensor.
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