This is not easy. The bulb is enclosed in a strong wire cage which I tried for ages to pull/prise off without success. In the end with the help of a small mirror and a torch I could see that the cage was secured by a single Phillips screw at it's base. I managed to loosen the screw and, pulling the cage at it's base towards the fridg centre, it slid away from it's restraint and could be removed from the bulb holder.
Robert Bovill, March 2016