We can get the flap sorted for you probably as part of the service, the meter being out will as Pete said be down to a miss match for the screen so it will be out of callibration, the new accute matte screen Pete sends should sort that but again we could check the prism out at the same time for any problems for you.
If you want to give me a call on 01625 575591 please do feel free to do so, here to help wherever possible.