Weather station issues

After 14 years of reliable service, It looks like my trusty Davis Vantage Pro weather station is starting to show its age. I'm experiencing more frequent data transmission problems which means current weather data is not getting uploaded to my website. The issue appears to be a failure with the super-capacitor in the sensor suite (ISS) which helps to power the unit when the solar panel is not operating (nighttime, cloudy skies, weak sun)  As a result, I only get data during bright sunlight hours wen the solar panel is providing power to the unit.  This ISS super-capacitor needs to be replaced (which is a bit of work) or I just might bite the bullet and upgrade to a new weather station altogether (after 14 years, it may be time)  In the meantime, I will try to keep the station running on backup batteries until I figure out what to do with it. If anyone has experience or advice on repairing the super-capacitor on the Davis Vantage Pro ISS, let me know.