2007 XK ‘vert, with electric power antenna. Antenna will extend and retract, but it makes a ratcheting noise my wife describes as growling, at end of travel. I’ve lubed the mast, then gave up and pulled the fuse. It’s cooling off now here in Texas, and I’m getting ambitious. Are these units repairable, or is it junk and figure out a work-around? Thanks in advance.