I just had my cluster apart and pulled the boards and the LCD out. Nothing to it really. You might be able to fix it simply by pulling the cluster apart, disconnecting the ribbon cables, reconnecting them and reassembling the cluster. If you have never disconnected an old school ribbon cable the ones in your cluster work like the example in this video:
https://www.youtube.com/watch?v=UntcYOV9Zgo
Good luck!