Cat Flap (Heaton BD9)

Hi. This is a Sure Flap microchip cat door. It needs a repair and the company supplied all the necessary components and instructions but I couldn't fix it because it was too fiddly for me. I'm sure it could be fixed by someone who knows what they're doing ! It will also need a clean . Collection preferably after Saturday 31st . I'll wait a few days to allow people time to respond .