replying to rover218, Fraser wrote:
If I remember correctly, it's held in place with lugs. Just prize out the
display gently with a blunt knife while pushing the lugs aside. This photo
might not help but I can't get another one as the unit is back on the wall
doing its job.
http://www.homeownershub.com/img/7s
http://www.homeownershub.com/img/7t