I would like to open it because I feel a touch while pedaling and gear changes are not smooth. Is there any video or manual to show how to open chain case?
There is another model in a video on YouTube, i would image the removal process is similar. It appears to take a little prying, then a couple screws and that's about it. i would inspect the chain cover closer and see if there are any obvious tabs or seams that separate or if there are any visible screws from the inside (through the wheel)
Here is the link: