I have a 2012 Ranger tandem axel. My brake release lever underneath the tongue is stuck and will not move. I even tapped it with a hammer to try and depress it but it won't budge. This happened several months ago. I have pulled it for many hundreds of miles since I discovered it and everything seems fine but I am a little worried and don't really know what to do. It tows fine and I still have brakes. How do I remedy this situation?