Seem to have a recurring problem with stations stored as favourites disappearing without reason. In particular, BBC national stations. Particularly frustrating as I use the timer to have the system wake me in the morning - and all I get is a faint hissing! Other station appear OK, but I have to say the system is a little temperamental, particularly

Fuse is easy to replace. Two screws on base, fuse contained in plastic cover. The fuses are of the "slow blow" type. I only know the UK rating (you are 110v so the rating will be different) and I guess they will be available from Radio Shack or similar.