Sunroof

My Sunroof in my 1999 Chrysler Sebring LXI coupe does not work properly. When I open it, the glass will move slowly back and then when I press the switch for it to close, it goes down but as it is about to close it reopens again not even three quarters of away open. I am at my whits end to get this fixed. I am worried that it will leak. The previous owner of my car told me how to fix it but I want the instructions in front of me. If someone knows how to fix this I would really appreciate it.

Thanks ahead