Hi @chrisjohn ,
This is only half an answer to your question.
Here is a link to a [https://www.youtube.com/watch?v=WjA2b7HqbMk|video] that shows how to remove the LCD screen from your camera.
If you do decide to follow this video ensure that you disconnect the battery ''before'' attempting to disconnect the video cable and remove the screen. Also reconnect the battery ''after'' you have replaced the LCD screen and connected the LCD screen cable.
I've searched online but cannot find a replacement lcd screen for a Go Pro Hero + LCD camera. You may have better luck. If you cannot find one either, check if there is a part number stamped on the back of the lcd screen in your camera. If there is, search online using just the part number ''only'' and see if you get any results.