Baxi duo-tec combi boiler constantly loosing pressure now no power?

Over the past month the boiler has had to be pressured almost every day. I thought the constant dripping was from overflo pipe hence the bowl underneath to catch rusty coloured water. Now there is no power at all. I checked and the spur fuse is ok. The boiler will not switch on at all. I have now found that the dripping is coming from inside the boiler as I have observed it dripping onto the bottom instruction cover when I opened it. Boiler is 5 years old previously no problems. Can anyone shed light on this?