You can find the relevant maintenance details in the user guide found here
Allow only jpg, jpeg, gif, png files. Allowed Max Size 1024 KB
Where do I find the Serial number?
Allow only jpg, jpeg, gif, png files.
Allow only mp4, webm, flv, mov, avi, mpeg files. Allowed Max Size 50 MB
We encourage you to send in a photo or short video of the fault you are experiencing. This assists us to analyse the issue.