02/OCT/2018: Replaced Temperature Sensor module (7346.070) today.  The dew point sensor failed after 11 years and 9 months in continuous operation (hope the new one lasts as long!).  New sensor reports a 0.5C higher for the version of the Davis VP2 in place.  Corresponding callibration made in console.  Will confirm dew point sensor with wetbulb test (when I locate my sling psychrometer).