Our water dispenser just started dripping a couple of weeks ago. We've never had a problem with it. We have hard water in our area and I'm not sure if it's due to mineral build up.

Today, I ran the water for 2-1/2 minutes to make sure it wasn't due to trapped air. It seemed to stop, so I cleaned up some of the mineral buildup on the tip of the spout. After that, it started dripping again.

If I need to change anything, what parts should I change? If any, are there any instructions on how to do so?