That will buff right out! ;)
DO NOT TOUCH A SCREW! send it to DJI and have it fixed. If for some crazy reason you decide to turn a screw DJI will know and your warranty will be voided. There are no parts you can get for it if you break something.
There is no real zoom on your drone.
It has digital zoom which simply enlarges the central part of an image.
The more it enlarges, the worse the resulting image is.
Digital zoom is great for marketing, but useless photographically.
You can...